Iron Minerals Flashcards by lon biscuit | Brainscape

Q

FeS₂

Description in Thin Section

A

Pyrite

Pale yellow/white

Very hard

euhedral cubes/anhedral

high reflectivity

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Q

A

Pyrite

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Q

Fe_1-xS

A

Pyrrhotite

Creamy pinkish brown

hardness >chalcopyrite
~pentlandite

<pyrite>
</pyrite>

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Q

A

Pyrrhotite

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Q

Fe₂O₃

A

Hematite

Grey white

Internal Reflections Deep red common

Aggregates of needles or blades

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Q

A

Hematite

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Q

Fe₃O₄

A

Magnetite

Grey; brownish tint

Lower reflectivity

lamellae of hm

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Q

A

Magnetite

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Q

FeS₂

A

Marcasite

Yellowish white

Intergrowths with pyrite; radiating bands

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Q

FeAsS

A

Arsenopyrite

White

Hardness >magnetite<pyrite></pyrite>

<p>
Euhedral, rhombic habit</p>

</pyrite>

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Q

(Fe,Ni)₉S₈

A

Sphalerite

Veinlets, flames; lamellae in po

Cream to yellow

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Q

A

Pentlandite

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