4.1" Blue Chalcedony Pseudomorph After Anhydrite - Peru

This is a fascinating formation of botryoidal blue chalcedony pseudomorphed after anhydrite crystals, collected from Rumipata, Peru. Remnants of the anhydrite crystals can be seen around the periphery of the specimen.

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.


FOR SALE
$135
DETAILS
SPECIES
Quartz var. Chalcedony
LOCATION
Rumipata, Ichuña District, General Sánchez Cerro Province, Moquegua, Peru
SIZE
4.1 x 2.3"
CATEGORY
ITEM
#318806