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Aragonite var. nicholsonite

#PD36480

Aragonite var. nicholsonite

#PD36480
Availability
Sold
Size
5.5 x 4 x 2.5 cm - Sm Cabinet 
Formula
CaCO3 (RRUFF)
Locality
Tsumeb mine, Tsumeb, Namibia
Tagged
carbonate

A miniature size specimen of "nicholsinite", the zinc-bearing variety of Aragonite with characteristic pseudohexagonal dipyramidal crystals with short prism faces and pinacoids. The crystals average 7-8mm and the largest is 1cm. The matrix looks to be a combination of Calcite and Siderite or Dolomite.

Aragonite

Formula
CaCO3 
Crystal System
Orthorhombic 
Crystal Habit
Pseudo Hexagonal, Columnar, Fibrous 
Cleavage
Distinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white, gray, yellowish white, reddish white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness
3.5-4 

Data courtesy of Webmineral.

Collection
Phillips Collection
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