Allanite-(Ce)

Alanitas, Allaniet, Alanāts, Allaniit, Allanit, Optit, Ортит, אלניט, แอลลาไนต์, 앨러 나이트, 褐れん石, 褐帘石


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


Formula: (Ca,Ce)2(Al,Fe2+,Fe3+)3(SiO4((Si2O7O(OH)
Mineral class: silicates
Crystal system: monoclinic
Mohs scale: 5.5 - 6
Density (g/cm3): 3.5 - 4.2
Refractive index: 1.640 - 1.828
Cleavage: poor
Colors: colorless, rose, brown, black
Transparency: transparent - opaque
Luster: vitreous - resinous - sub-metallic
Fluorescence: -
Pleochroism: X: olive-green, red-brown; Y: brown, yellow-brown; Z: red-brown, green-brown
Largest crystal: 90 cm?
Deposits: worldwide
Discovery: 1810
1st Description: 1810 (Thomson)
Name: in honor of the Scottish mineralogist Thomas Allan (1777 - 1833)

Allanite-(Ce) Mineral

Size: 5.5 x 4.5 x 1.5 cm

Origin: Trimouns Talc Mine / Luzenac / Ariège / Midi-Pyrénées / France

Photo by kind permission of © www.irocks.com
Allanite Mineral

Allanite-(Ce) Mineral

Size: 2.7 x 1.8 x 0.9 cm

Origin: Minas Gerais / Brazil

Photo by kind permission of © www.lucianabarbosa.com
Allanite Mineral

Allanite-(Ce) Mineral

Image width: 0.6 cm

Origin: Laacher See Lake / Eifel Mts. / Germany

Photo by kind permission of © Stephan Wolfsried
Allanite Mineral
Allanite-(Ce)

Size: 1.22 x 0.96 x 0.64 cm
Weight: 6.22 ct
Origin: Brazil

Photo by kind permission of © www.gemfrance.com


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