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

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

Prismatine

Size: 14.51 x 14.34 x 11.50 mm
Weight: 17.10 ct
Origin: Sri Lanka or Madagascar

Photo by kind permission of © cvs.fi

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