Difference Between
versus

Gypsum vs. Anhydrite: Know the Difference

Shumaila Saeed
By Shumaila Saeed || Published on January 10, 2024
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, whereas anhydrite is its anhydrous form.
Gypsum vs. Anhydrite

Key Differences

Gypsum is a hydrate with two water molecules attached to each calcium sulfate unit, making it softer. Anhydrite lacks these water molecules, resulting in a harder mineral.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024
Gypsum forms through the evaporation of seawater and is often found in sedimentary rock layers, whereas anhydrite forms from the dehydration of gypsum under specific geological conditions.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024
Gypsum is typically softer, with a Mohs hardness of about 2, and can be scratched with a fingernail. Anhydrite is harder, with a Mohs hardness of 3 to 3.5.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024
Gypsum is widely used in construction, especially in drywall and plaster. Anhydrite is less common in direct applications but can be used as a drying agent or in cement.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024
Gypsum can transform into anhydrite through dehydration, and anhydrite can rehydrate to form gypsum under the right conditions, highlighting their close relationship.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024
ADVERTISEMENT

Comparison Chart

Chemical Composition

CaSO4·2H2O
CaSO4
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Hardness

Softer (Mohs hardness of ~2)
Harder (Mohs hardness of 3 to 3.5)
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Water Content

Contains water molecules
Lacks water molecules
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Formation

From evaporation of seawater
From dehydration of gypsum
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Uses

Drywall, plaster, fertilizer
Cement additive, drying agent
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024
ADVERTISEMENT

Gypsum and Anhydrite Definitions

Gypsum

A soft mineral used in plaster and drywall.
The walls were made of gypsum board.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023

Anhydrite

A hard mineral formed by the dehydration of gypsum.
Anhydrite is present in the deeper layers of the soil.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023

Gypsum

A sulfate mineral used as a fertilizer for alkaline soils.
We added gypsum to our farm soil.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023

Anhydrite

A sulfate mineral used in cement production.
The factory processes anhydrite for cement.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023

Gypsum

A mineral with high water content, making it easy to shape.
The gypsum rock was easily carved into a sculpture.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023
ADVERTISEMENT

Anhydrite

A mineral used as a drying agent in various industries.
Anhydrite effectively absorbed moisture in the warehouse.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023

Gypsum

A white or colorless mineral used in making plaster of Paris.
The artist sculpted a model using gypsum.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023

Anhydrite

A colorless to blue or violet mineral found in sedimentary rocks.
The sedimentary rock contained veins of blue anhydrite.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023

Gypsum

A crystal form often found in sedimentary rocks.
The geologist found a beautiful gypsum crystal.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023

Anhydrite

A naturally occurring crystal in evaporite deposits.
We found anhydrite crystals in the dried lake bed.
Shumaila Saeed
Shumaila Saeed
Dec 25, 2023

Gypsum

A widespread colorless, white, or yellowish mineral, CaSO4·2H2O, used in the manufacture of plaster of Paris, various plaster products, and fertilizers.
Shumaila Saeed
Shumaila Saeed
Dec 13, 2023

Anhydrite

A colorless, white, gray, blue, or lilac mineral of anhydrous calcium sulfate, CaSO4, occurring as layers in gypsum deposits.
Shumaila Saeed
Shumaila Saeed
Dec 13, 2023

Gypsum

A mineral consisting of hydrated calcium sulphate. When calcinated, it forms plaster of Paris.
Shumaila Saeed
Shumaila Saeed
Dec 13, 2023

Anhydrite

(mineral) An evaporite mineral made of anhydrous calcium sulfate.
Shumaila Saeed
Shumaila Saeed
Dec 13, 2023

Gypsum

A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.
Shumaila Saeed
Shumaila Saeed
Dec 13, 2023

Anhydrite

A mineral of a white or a slightly bluish color, usually massive. It is anhydrous sulphate of lime, and differs from gypsum in not containing water (whence the name).
Shumaila Saeed
Shumaila Saeed
Dec 13, 2023

Gypsum

A common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)
Shumaila Saeed
Shumaila Saeed
Dec 13, 2023

Repeatedly Asked Queries

What is gypsum?

A soft mineral used in construction and agriculture.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

How is gypsum formed?

From the evaporation of seawater in sedimentary environments.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Can gypsum be used in agriculture?

Yes, as a soil conditioner and fertilizer.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Can anhydrite be used in construction?

Less commonly, but in cement and as a drying agent.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

How does anhydrite differ from gypsum?

Anhydrite is harder and lacks water molecules.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Is gypsum soluble in water?

Yes, but only slightly.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

What are the uses of gypsum?

In drywall, plaster, and as a soil amendment.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Can gypsum form crystals?

Yes, often in a clear, tabular form.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Is gypsum safe for construction?

Yes, it's non-toxic and fire-resistant.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

What is the significance of gypsum in drywall?

It's the primary component due to its fire resistance and ease of use.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Does anhydrite have any agricultural uses?

Not typically, due to its lack of solubility and hardness.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

What is anhydrite?

A hard mineral formed from the dehydration of gypsum.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Is anhydrite found in nature?

Yes, in evaporite deposits and sedimentary rocks.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

How is anhydrite mined?

Through traditional mining methods in evaporite deposits.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

What geological conditions create anhydrite?

Dehydration of gypsum under high temperature and pressure.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

What colors can gypsum be?

Typically white, but can have impurities causing color.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Can gypsum be transparent?

Yes, in its pure, crystal form.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Can anhydrite revert to gypsum?

Yes, through rehydration under specific conditions.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

What is the Mohs hardness of gypsum?

About 2, making it quite soft.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Is anhydrite used in everyday products?

Mostly in specialized industrial applications.
Shumaila Saeed
Shumaila Saeed
Jan 10, 2024

Share this page

Link for your blog / website
HTML
Link to share via messenger
About Author
Shumaila Saeed
Written by
Shumaila Saeed
Shumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.

Popular Comparisons

Trending Comparisons

Poster vs. InfographicPoster vs. Infographic
Shumaila SaeedShumaila Saeed
December 25, 2023
A Poster is a large printed image or notice for public display, while an Infographic is a visual representation of information or data.
Japanese Eyes vs. Chinese EyesJapanese Eyes vs. Chinese Eyes
Shumaila SaeedShumaila Saeed
December 25, 2023
Japanese Eyes and Chinese Eyes refer to linguistic structures in Japanese and Chinese respectively, each reflecting unique aspects of grammar and syntax.
Pulley vs. SheavePulley vs. Sheave
Hifza NasirHifza Nasir
April 4, 2024
A pulley is a wheel on an axle designed to support movement and change of direction of a taut cable, while a sheave is the wheel part of a pulley system that specifically interacts with the cable.
LTE vs. CDMALTE vs. CDMA
Shumaila SaeedShumaila Saeed
February 4, 2024
LTE (Long Term Evolution) is a 4G wireless communication standard with high-speed data transfer, while CDMA (Code Division Multiple Access) is an older 2G/3G technology for mobile networks.
Nike Air Force 1 LE vs. Nike Air Force 1 '07Nike Air Force 1 LE vs. Nike Air Force 1 ’07
Hifza NasirHifza Nasir
April 16, 2024
Nike Air Force 1 LE often represents limited edition releases with unique designs, while Nike Air Force 1 '07 is a modern version of the classic, maintaining the iconic style with updated materials.
Goth vs. AltGoth vs. Alt
Shumaila SaeedShumaila Saeed
February 5, 2024
Goth is a dark, often Victorian-influenced subculture and style, while Alt (alternative) is a broader term encompassing non-mainstream styles and attitudes.
Pycharm Community vs. Pycharm ProPycharm Community vs. Pycharm Pro
Shumaila SaeedShumaila Saeed
February 4, 2024
PyCharm Community is a free, open-source IDE for Python development, while PyCharm Pro is a paid version with additional advanced features like web development support and database tools.
Formal Assessment vs. Informal AssessmentFormal Assessment vs. Informal Assessment
Shumaila SaeedShumaila Saeed
December 25, 2023
Formal assessments are structured and standardized, while informal assessments are flexible and observational.
House of Representatives vs. SenateHouse of Representatives vs. Senate
Shumaila SaeedShumaila Saeed
December 25, 2023
The House of Representatives, based on population, drafts tax legislation and impeachment charges, while the Senate, with equal representation per state, tries impeachments and ratifies treaties.
Moms vs. Mom'sMoms vs. Mom’s
Shumaila SaeedShumaila Saeed
February 22, 2024
"Moms" is the plural form of "mom," referring to multiple mothers, while "Mom's" is the possessive form of "mom," indicating something belongs to or is related to a mother.
Login vs. LogonLogin vs. Logon
Shumaila SaeedShumaila Saeed
December 25, 2023
"Login" and "Logon" are often used interchangeably to describe the process of gaining access to a computer system, but "login" can also refer to the credentials used for access.
Shall vs. Shall beShall vs. Shall be
Shumaila SaeedShumaila Saeed
February 14, 2024
"Shall" is a modal verb used to indicate future action or a strong intention, while "shall be" is its future tense form, often implying a sense of obligation or inevitability.
2 Pole Motors vs. 4 Pole Motors2 Pole Motors vs. 4 Pole Motors
Shumaila SaeedShumaila Saeed
December 25, 2023
2 Pole Motors have one pair of magnetic poles and run at higher speeds, while 4 Pole Motors have two pairs of poles and operate at lower speeds, offering higher torque.
Happen vs. OccurHappen vs. Occur
Shumaila SaeedShumaila Saeed
December 25, 2023
"Happen" refers to events or actions taking place, often with an unplanned or casual connotation, while "occur" implies events or phenomena that take place, often with a more formal or scientific tone.
Contact Force vs. Field ForceContact Force vs. Field Force
Shumaila SaeedShumaila Saeed
December 25, 2023
Contact Force is a force applied through physical contact, while Field Force acts over a distance without physical contact.
CeraVe vs. LubridermCeraVe vs. Lubriderm
Shumaila SaeedShumaila Saeed
February 8, 2024
CeraVe and Lubriderm are both skincare brands; CeraVe focuses on ceramide-rich formulas, while Lubriderm is known for its basic, gentle moisturizers.
NM3 vs. M3NM3 vs. M3
Hifza NasirHifza Nasir
April 19, 2024
NM3 measures gas volume under Normal conditions (0°C and 1.01325 bar), while M3 measures volume under the conditions at which it is measured, without standard adjustment.
Cache Memory vs. Main MemoryCache Memory vs. Main Memory
Hifza NasirHifza Nasir
May 18, 2024
Cache memory is a fast, volatile memory for quick access to frequently used data, enhancing processor speed. Main memory (RAM) is a larger, slower volatile memory for currently used data and programs.
FHSS vs. DSSSFHSS vs. DSSS
Shumaila SaeedShumaila Saeed
February 25, 2024
FHSS (Frequency-Hopping Spread Spectrum) uses rapid frequency changes within a band. DSSS (Direct Sequence Spread Spectrum) spreads signals over a wider frequency using a code.
Term vs. SemesterTerm vs. Semester
Shumaila SaeedShumaila Saeed
December 25, 2023
Term is a general period for any division of the academic year, while Semester specifically refers to half of an academic year.
Gorilla Glass 3 vs. Gorilla Glass 5Gorilla Glass 3 vs. Gorilla Glass 5
Shumaila SaeedShumaila Saeed
January 1, 2024
Gorilla Glass 3 offers improved scratch resistance and durability compared to its predecessors, while Gorilla Glass 5 focuses on enhanced drop protection and toughness.
2chan vs. 4chan2chan vs. 4chan
Shumaila SaeedShumaila Saeed
February 1, 2024
2chan is a Japanese imageboard primarily for sharing images and discussion. 4chan is an English-language imageboard with a diverse range of topics and more international user base.
Interviewer vs. IntervieweeInterviewer vs. Interviewee
Shumaila SaeedShumaila Saeed
December 25, 2023
The interviewer conducts the interview, asking questions and guiding the conversation, while the interviewee is the one responding and being evaluated.
Catapult vs. TrebuchetCatapult vs. Trebuchet
Shumaila SaeedShumaila Saeed
January 4, 2024
A catapult is a ballistic device using tension or torsion to launch projectiles, while a trebuchet is a type of catapult using a counterweight for greater force and distance.

Featured Comparisons

New Comparisons