Felsobanyaite

General Information:
 Chemical Formula:
Al4(SO4)(OH)10·5(H2O)
 Composition:
(Molecular Weight = 464.14 gm)
Aluminum 23.25 % Al
Hydrogen 4.34 % H 
Sulfur 6.91 % S 
Oxygen 65.50 % O 
 Empirical Formula:
Al4(SO4)(OH)10·5(H2O)
 Locality:
Baia Sprie, Maramures, Romainia (formerly known as Felsobanya, in Hungary).
 Name Origin:
Named for the locality.
Physical Properties:
 Cleavage:
[001] Perfect, [100] Distinct, [010] Distinct
 Color:
colorless, yellow, or white.
 Density:
2.35
 Diaphaniety:
Transparent to Translucent
 Habits:
Globular - Spherical, or nearly so, rounded forms (e.g. wavellite)., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Aggregates - Made of nume rous individual crystals or clusters.
 Hardness:
1.5 - Between Talc and Gypsum
 Luster:
Vitreous - Pearly
More details...