General Information:
Chemical Formula:
Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]·x(H2O), x>=20
Environment:
Ca-rich xenolith in leucite tephrite lava.
IMA Status:
Approved IMA 1995
Locality:
Bellberg volcano near Mayen, in the Laacher See volcano area, Eifel, Germany.
Name Origin:
Named after Jochen Tschortner (1941-), mineral collector and finder of the mineral.
Physical Properties:
Cleavage:
None
Color:
light blue.
Density:
2.1
Diaphaniety:
Transparent
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., ,
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
pale blue
More details...