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Kupletskite crystals
© Doug Merson
Kupletskite crystals
© Modris Baum
Kupletskite crystals
© Jason B. Smith
(K,Na)(Mn,Fe+2(Ti,Nb)Si24(O,OH)
Kupletskite, the potassium-iron dominant member of the astrophyllite group, is uncommon at MSH. It cannot be distinguished visually from astrophyllite.
PHYSICAL CHARACTERISTICS:
Color is usually bronze-yellow.
Luster is vitreous to submetallic.
Diaphaneity is transparent to opaque.
Crystal System is triclinic; 1.
Crystal Habits include tabular crystals to 3mm, acicular crystals,
and micaceous or fibrous masses.
Cleavage {001} is perfect and {100} is poor.
Fracture is uneven.
Hardness is approximately 4.
Specific Gravity is approximately 3.2 g/cm
Streak is brown.
Associated Minerals include aegirine, albite, ancylite, arfvedsonite,
calcite, eudialyte, fluorite, microcline and natrolite.
Distinguishing Features: Crystal habit.
Origin: Named in 1956 after Boris Mikhailovich Kupletski (1894-1965)
and Elsa Maxilianovna Bonshedt-Kupletskaya (1897-1974),
Russian geologists.
CLASSIFICATION:
Dana System
# 69.1.1.2
Strunz Classification
# VIII/G.12-50
REFERENCES:
MinRec 21:315 (1990), Dana 8:1383 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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Kupletskite crystals
© Stephan Wolfsried
Kupletskite crystals
© Stephan Wolfsried
Kupletskite crystals
© Steven Stuart