Pyroaurite

Locality: Scotch Lake quarry, Scotch Lake, Cape Breton County, Nova Scotia, Canada Source: Donald Doell

Chemical Formula: Mg6Fe3+2(OH)16[CO3]·4H2O
Locality: Langbanshyttan, Sweden.
Name Origin: From the Greek, pyro and the Latin aurium, “fire” and “golden” because of the gold-like submetallic scales present in its type locality.

History

Authors (inventeurs) : IGELSTROEM
Discovery date: 1865
Town of Origin: MINE DE LANGBAN, FILIPSTAD, VARMLAND
Country of Origin : SUEDE

Optical properties

Optical and misc. Properties : Flexible  –   Transparent  –
Refractive Index: from 1,54 to 1,56

Physical properties

Hardness : 2,50
Density: 2,12
Color : yellowish white; brownish white; greenish; colorless; brown; silver-white; green; brown yellow; pale blue
Luster: vitreous; waxy; nacreous
Streak/Trace : white
Cleavage : yes

Photos:

Pyroaurite Locality: Långban Mine, Filipstad, Värmland, Sweden (Type Locality for Pyroaurite) Overall Size: 7x4x2 cm Crystals: 0.5 mm © JohnBetts-FineMinerals
Pyroaurite from Langban, Varland, Sweden. Held in the A. E. Seaman Mineral Museum. © Chris857
Pyroaurite, Sjogrenite Locality: Palabora mine, Loolekop, Phalaborwa, Limpopo Province, South Africa Size: miniature, 6 x 3.4 x 2.6 cm “Courtesy of Rob Lavinsky, The Arkenstone, www.iRocks.com”
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