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Mineralpedia Details for Aragonite

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Aragonite

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 
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Aragonite from Tsumeb mine, Tsumeb, Namibia

Aragonite
            from Tsumeb mine, Tsumeb, Namibia

Abundant at Tsumeb, this lead-bearing variety called "tarnowitzite" forms pseudo-hexagonal white prisms with pyramidal terminations. This crystal is 2cm long. There are actually three crystals on matrix.

"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.

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Aragonite from Cumberland, England

Aragonite
            from Cumberland, England

White, stalititic growth Aragonite.

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Aragonite from Broken Hill, New South Wales, Australia

Aragonite
            from Broken Hill, New South Wales, Australia

Colorless long prismatic crystals to 3.5cm.

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Aragonite from Rosiclare, Hardin Co., Illinois, United States

Aragonite
            from Rosiclare, Hardin Co., Illinois, United States

Snow white pointed Aragonite clusters with individual crystals up to 3mm on purple Fluorite.

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Aragonite from Minglanilla, Castile-La Mancha, Spain

Aragonite
            from Minglanilla, Castile-La Mancha, Spain

Purple to colorless prismatic, twinned Aragonite crystal with many smaller. 

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