4.7" Polished Green Magneprase Slab - Western Australia

This is a 4.7" wide, polished slab of magneprase, collected from a location south of Kalgoorlie in the Eastern Goldfields of Western Australia. It gained the name "magneprase" from its composition which includes magnesite (white), prase chalcedony, and chromium chalcedony. The presence of chromium gives it the unique green hues.

It comes with an acrylic display stand.

Chalcedony is any microcrystalline variety of silica composed of very fine intergrowths of quartz and mogánite: microcrystalline minerals have microscopic crystals that cannot be observed by the naked eye. Both quartz and mogánite have the same chemical formula SiO2 (silicon dioxide), but different crystal structures. When free from impurities, chalcedony is colorless and transparent. Depending on impurities present during formation, chalcedony can form in a wide variety of colors including red, yellow, green, blue, purple, grey, white, and numerous hues in between. Chalcedony is quite hard at 7 on the Mohs Hardness Scale: this matches its main component quartz, which is the benchmark mineral for the scale at 7.
Magnesite (White), Prase Chalcedony & Chromium Chalcedony
South of Kalgoorlie, Eastern Goldfields, Western Australia
4.7 x 3.1", .25" thick