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
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