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Thalcusite crystals - click for larger pic
Thalcusite crystal - 3mm
© Gilles Haineault

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Thalcusite
Tl2Cu3FeS4

     Thalcusite occurs very rarely at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually dark gray to black.
Luster is metallic.
Diaphaneity is opaque.
Crystal System is tetragonal; I4/mmm.
Crystal Habits include small and thin bladed crystals to 1mm.
Cleavage not apparent.
Fracture is (??).
Hardness is 2.5
Specific Gravity is approximately 6.6 g/cm3.
Streak is black.
Associated Minerals include aegirine, eudialyte, lovozerite, sodalite,
   ussingite, villiaumite and vuonnemite.
Distinguishing Features: Crystal habit.
Origin: Named in 1976 for its composition: thallium, copper and
   sulfur, (Thal + Cu + S + ite).

CLASSIFICATION:

Dana System
# 2.5.5.1

Strunz Classification
# II/F.04-30

REFERENCES:
MinRec 21:342 (1990), Dana 8:54 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX<br--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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