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Erdite crystals - click for larger pic
Erdite crystals
Photo by Gilles Haineault
© Gilles Haineault

Erdite crystals - click for larger pic
Erdite crystals
Photo by Gilles Haineault
© Gilles Haineault

Erdite crystals - click for larger pic
Erdite crystals
Photo by Doug Merson
© Doug Merson

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Home > Mineral Descriptions > Erdite - (3 Photos)



Erdite
NaFeS2 ยท 2H2O

     Erdite is extremely rare at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually dark copper-red to bronze.
Luster is metallic.
Diaphaneity is translucent to opaque.
Crystal System is monoclinic; C2/c.
Crystal Habits include flattened, twisted and curled wire-like crystals.
Cleavage {110} is good.
Fracture is ??.
Hardness is 2.
Specific Gravity is approximately 2.3 g/cm3.
Streak is black.
Associated Minerals include lovozerite, natrolite, rasvumite,
   sidorenkite, sodalite, tugtupite, ussingite and vuonnemite.
Distinguishing Features: Crystal habits.
Origin: Named in 1980 after Richard C. Erd (b.1924), U.S. mineralogist
   who first synthesized the compound.

CLASSIFICATION:

Dana System
# 2.14.5.1

Strunz Classification
# II/F.09-10

REFERENCES:
b>MinRec 21:308 (1990), Dana 8:142 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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