General Information:
Chemical Formula:Mn4Be3(SiO4)3S
Composition:(Molecular Weight = 555.10 gm)Manganese 39.59 %
MnBeryllium 4.87 %
BeSilicon 15.18 %
SiSulfur 5.78 %
S Oxygen 34.59 %
O Empirical Formula: Mn1+4Be3(SiO4)3S
Environment:Found in skarns, pegmatites, and hydrothermally altered rocks.
Locality:Schwarzenberg and Breitenbrunn, Germany.
Name Origin:From the Greek helios - "sun."
Physical Properties: Cleavage:[111] Indistinct, [111] Indistinct, [111] Indistinct
Color:brown, brownish yellow, gray, yellow, or yellow green.
Density:3.16 - 3.36, Average = 3.26
Diaphaniety:Translucent to opaque
Habits:Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:6-6.5 - Orthoclase-Pyrite
Luminescence:None.
Luster:Vitreous - Resinous
Streak:grayish white
More details...
