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Sulfates and sulfur salts

Marcasite

Also known as Marcasite (FeS2), Pirita blanca, Cockscomb pyrites

CAS 1317-66-4Formula FeS2Molar mass 119.98 g/molEC 235-106-8
GHS signal word: Danger. Pictograms: Harmful or irritant, Serious health hazard, Hazardous to the environment 12 suppliers listed Drug substance
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Marcasite chemical structure, FeS2, CAS 1317-66-4
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
1317-66-4
Formula
FeS2
Molar mass
119.98 g/mol
Density
5.2 @25 °C
HS code
283090
Category
Sulfates and sulfur salts

What is Marcasite?

Plain description, key identifiers and synonyms

Marcasite is a chemical substance with the molecular formula FeS2 and a molar mass of 119.98 g/mol. Its CAS registry number is 1317-66-4.

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
1317-66-4Other or deprecated CAS: 12068-85-8
EC number
235-106-8
Molecular formula
FeS2
UNII
132N09W4PR
InChIKey
NIFIFKQPDTWWGU-UHFFFAOYSA-N
InChI
InChI=1S/Fe.S2/c;1-2/q+2;-2
SMILES (canonical and isomeric)
[S-][S-].[Fe+2]

Synonyms

  • Marcasite (FeS2)
  • Pirita blanca
  • Cockscomb pyrites
  • Ferrous disulfide
  • Iron pyrite
  • Iron pyrite (fes2)
  • Iron disulfide (fes2)
  • Hydropyrite
  • Iron sulfide, marcasite

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Density
5.2 @25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
119.98 g/molcalc.
Exact mass
119.8791 Dacalc.
LogP (octanol/water)
-0.01calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H317May cause an allergic skin reaction.
  • H334May cause allergy or asthma symptoms or breathing difficulties if inhaled.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (17)
  • P233Keep container tightly closed.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P271Use only outdoors or in a well-ventilated area.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P342 + P316If experiencing respiratory symptoms: Get emergency medical help immediately.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P403Store in a well-ventilated place.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Marcasite suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 12 suppliers
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Where suppliers are based

12 suppliers in 9 countries

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Marcasite price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Roles

  • catalyst
  • reducing agent

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • Active ingredient in FDA approved drug labels

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Marcasite is traded under.

HS 2830.90Indicative HS code

Sulphides, polysulphides, whether or not chemically defined, other

World exports in 2024
$382M
+2.0% vs 2023, imports $246M
2019 to 2024
Top exporters
  1. Austria33.1%
  2. Philippines31.4%
  3. Germany9.1%
Top importers
  1. Germany12.7%
  2. South Korea11.7%
  3. China10.7%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Marcasite is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Marcasite, based on the data on this page

What is Marcasite?

Marcasite is a chemical substance with the molecular formula FeS2 and a molar mass of 119.98 g/mol. Its CAS registry number is 1317-66-4.

What is the CAS number of Marcasite?

The CAS registry number of Marcasite is 1317-66-4. Other or deprecated CAS numbers: 12068-85-8.

What is the molecular formula and weight of Marcasite?

The molecular formula of Marcasite is FeS2 and its molar mass is 119.98 g/mol.

What is Marcasite used for?

Known uses and roles of Marcasite include catalyst and reducing agent.

Is Marcasite hazardous?

Marcasite carries the GHS signal word "Danger". Main hazards: may cause an allergic skin reaction, may cause allergy or asthma symptoms or breathing difficulties if inhaled, very toxic to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Marcasite?

Marcasite is usually classified under HS code 283090 (Sulphides, polysulphides, whether or not chemically defined, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Marcasite?

CompoundList lists 12 suppliers of Marcasite in India, Canada, China, Germany and 5 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Marcasite in India?

3 suppliers in India list Marcasite on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Marcasite?

Suppliers quote Marcasite on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Marcasite

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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