3.4" Quartz and Adularia Crystal Association - Norway

This is an alluring association of pristine quartz crystals and white adularia (variety of orthoclase). The crystals formed from a schist matrix and most of the adularia can be found on what could be considered the bottom of the specimen. This quartz cluster was collected from Hardangervidda, Norway.

Silicon Dioxide, also known as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.

Adularia is a variety of feldspar that had the chemical formula KAlSi3O8. It's found most often as colorless to white aggregations within metamorphic rock, with one example being formation within cavities of crystalline schists. The crystals are commonly twinned, glassy and prismatic in structure, and in some cases they display opalescent characteristics. Adularia is very similar to orthoclase, even baring the same chemical formula, however it has a different crystalline structure and reacts differently to various tests.
Quartz & Orthoclase var. Adularia
Hardangervidda, Norway
3.4 x 2.9"