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
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