Ametrine
Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
Mineral NameAmetrine
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lustervitreous
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.65
Colorspurple, yellow, brown
Transparencytranslucent
Type LocalityAnahí Mine, La Gaiba District, Sandoval Province, Santa Cruz Department, Bolivia
Mineral GroupSilicates
Usesjewelry, collector's specimens, ornamental
Associated Mineralsfeldspar, mica, calcite
Rarityuncommon
Description
This image displays a rough, irregularly shaped specimen of ametrine, exhibiting distinct zones of translucent purple and yellowish-brown coloration.
Geological Context
Ametrine forms in hydrothermal veins within host rocks, typically granitic, where varying temperature and pressure conditions, along with iron impurities and natural irradiation, create the unique bicolored quartz.
