General Information:
Chemical Formula:
(Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O)
Composition:
(Molecular Weight = 511.39 gm)
Barium 2.69 % Ba
Strontium 10.28 % Sr
Calcium 2.35 % Ca
Aluminum 15.83 % Al
Arsenic 19.05 % As
Phosphorus 4.24 % P
Hydrogen 1.18 % H
Oxygen 40.67 % O
Fluorine 3.72 % F
Empirical Formula:
Sr0.6Ca0.3Ba0.1Al3(AsO4)1.3(PO4)0.7(OH)4F·(H2O)
IMA Status:
Approved IMA 1985
Locality:
Clara mine, Oberwolfach, Black Forest, Germany.
Name Origin:
Named for the chemical composition and it's relationship to goyazite.
Physical Properties:
Cleavage:
None
Color:
greenish white, gray green, yellow, or light green.
Density:
3.33 - 3.35, Average = 3.34
Diaphaniety:
Transparent
Habits:
Reniform - "Kidney like" in shape (e.g.. hematite)., Encrustations - Forms crust-like aggregates on matrix.,
Hardness:
4 - Fluorite
Luster:
Vitreous (Glassy)
Streak:
white
More details...