General Information:
Chemical Formula:
(Mn,Ca)(La,Ce,Ca,Nd)AlMn+++Mn++(SiO4)(Si2O7)O(OH)
Environment:
Forms a series with piemontite.
IMA Status:
Approved IMA 1994
Locality:
Found in a manganese-rich silicate-carbonate rock, Petalon Mountain, Andros Island, Cyclades, Greece.
Name Origin:
Named after its discovery locality.
Physical Properties:
Color:
reddish brown.
Density:
4.21
Diaphaniety:
Transparent
Luster:
Vitreous (Glassy)
More details...