Vitreous twinned Harmotome crystals on matrix3D ModelNoAI
Locality: Sankt Andreasberg, Germany
No.: 6077
Size: 9.2 x 4.1 x 1.3 cm
Formula: (Ba0.5,Ca0.5,K,Na)5(Al5Si11O32) • 12H2O
Description: Cluster of Haromotome crystals on matrix from the type locality. Harmotome belong to zeolite group (Phillipsite-Harmotome series), and is one of the rarer zeolite. Like other zeolites, Harmotome occurs with calcite in the amygdaloidal cavities of basaltic rocks.
The twins of Harmotome are considered classics among collectors who like twinned minerals. If perfectly formed, a twinned crystal of Harmotome can appear to be composed of three prismatic crystals grown through the each others center at nearly 90 degree angles. Each termination can look like the end of a blunted phillips head screw driver.
Website: http://geology.uaic.ro/muzee/mineralogie/
Concept & 3D-modelling by Andrei Ionut APOPEI
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