Graphite Sprays In Blue Calcite Natural Mineral From Erongo Region Namibia
Size-
7.2cm x 5.4cm x 3.2cm
Weight-
136g
You will receive the item in the photo
The combination of graphite sprays in blue calcite is a unique and sought after mineral.
Graphite:
Graphite is a fascinating naturally occurring crystalline form of carbon.
Crystal system- Hexagonal
Mineral class- Native elements
Hardness-1.0-2.0
Rock formation- Graphite is formed primarily through the metamorphism of carbon rich sedimentary and organic materials. As heat and pressure drive off hydrogen and oxygen from dead plant/animal matter in ancient limestone or shale deposits,pure carbon is left behind to crystallize. It typically appears as flakes,scales or delicate sprays.
Blue calcite:
Blue calcite is a beautiful coloured calcium carbonate rich variant of ordinary calcite.
Crystal system-Trigonal
Mineral class-Carbonates
Hardness-3.0
Rock formation- calcite is a secondary mineral. It forms primarily in sedimentary rocks like limestone and chalk, through the deposition and accumulation of marine organism shells or in hydrothermal veins where calcium rich mineralized waters precipitate large crystals.
When you find graphite inclusions or on the surface of blue calcite,it indicates a setting where calcium rich hydrothermal solutions encountered carbon bearing metamorphic rocks such as schists or marbles. The graph crystallizes as branching starburst like sprays directly onto or outside the host calcite during cooling of dither metamorphic shifts.
