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Erdite crystals
Photo by Gilles Haineault
© Gilles Haineault
Erdite crystals
Photo by Gilles Haineault
© Gilles Haineault
Erdite crystals
Photo by Doug Merson
© Doug Merson
NaFeS · 2H
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; 2/
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/cm
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
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