Prismatine

Prismatin


Commonly known      rarer (so called collectors stones)      very rare (rarities)      relatively rare organic material


Formula:
([ ],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22
(Mg,Al,Fe2+)5-6Al4[(O,OH,F)3 | BO3 | ((Si,Al)O4)4]
Mineral class: silicates
Crystal system: orthorhombic
Mohs scale: 6.5 - 7
Density (g/cm3): 3.34 - 3.35
Refractive index: 1.669 - 1.684
Cleavage: perfect
Colors: grey, brown, green
Transparency: transparent - translucent
Luster: vitreous
Fluorescence: -
Pleochroism: -
Largest crystal: ?
Deposits: Antarctica, Germany, Sweden, Slovakia, Tanzania, USA
Discovery: 1886
1st Description: 1886 (Sauer)
Name: ref. to the prismatic form of the crystals

Prismatine Mineral

Size: 6 x 4 x 3 cm

Origin: Stakholmen Quartz Quarry / Hassela / Nordanstig / Hälsingland / Sweden

Photo by kind permission of © António Manuel Ináçio Martins
Prismatine Mineral

Prismatine

Size: 0.33 cm
Weight: 0.13 ct
Origin: Tanzania

Photo by kind permission of © www.rocklogic.biz

Prismatine

Size: 0.26 cm
Weight: 0.07 ct
Origin: Tanzania

Photo by kind permission of © www.thegemtrader.com


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