5.9" Polished Purple Dendritic Chalcedony Slab - Western Australia

This is an 5.9" wide, polished slab of purple dendritic chalcedony from near the town of Newman in the Pilbara Region of Western Australia. This variety of dendrite filled chalcedony forms as nodules in saprolite (chemically weathered/decomposed rock) clay that overlies a large serpentine outcrop. It typically ranges in color from purple to pale green.

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.
Quartz var. Chalcedony
Near Newman, Pilbara Region, Western Australia
5.9 x 4.1", .4" thick