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Marcasite crystals - click for larger pic
Marcasite crystals
© Doug Merson

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Marcasite crystals
© Modris Baum

Marcasite crystals - click for larger pic
Marcasite crystals
© Bill Lechner

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Home > Mineral Descriptions > Marcasite - (3 Photos)



Marcasite
FeS2

     Marcasite is found rarely at MSH, it occurs in narrow fracture cavities and fissures in hornfels, or in nepheline syenite close to hornfels contact.

PHYSICAL CHARACTERISTICS:

Color is usually pale brass-yellow.
Luster is metallic.
Diaphaneity is opaque.
Crystal System is orthorhombic; Pnnm.
Crystal Habits include thin bladed single crystals to 2-3mm
   and oriented crystal groups.
Cleavage {101} is distinct.
Fracture is uneven.
Hardness is 6 - 6.5.
Specific Gravity is approximately 4.9 g/cm3.
Streak is gray to black.
Associated Minerals include Albite, analcime, calcite, dawsonite,
   fluorite, ilmenite, magnesite, muscovite, pyrite, pyrrhotite and quartz.
Distinguishing Features: crystal habit and forms.
Origin: Named in 1845 from the Assyrian markhashitu, related
   to the Arabic markhashi, an old province thought to be located
   in the northeastern part of Persia.

CLASSIFICATION:

Dana System
# 2.12.2.1

Strunz Classification
# II/D.20-10

REFERENCES:
MinRec 21:321 (1990), Dana 8:120-121 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
¤¤

MX
--

SS
--

MC
--

HF
¤¤

BR
--

SX
--

FR
--

Legend

Marcasite crystals - click for larger pic
Marcasite crystals
© Modris Baum