Cristal de roca
Cuarzo is a mineral with formula SiO₂, in the Silicatos [Tectosilicatos (Grupo Cuarzo)] group. This specimen comes from Collier Creek Mine, Mount Ida, Montgomery County, Arkansas, Estados Unidos and joined the Terrium collection in 2001.
Description
Rock crystal of exceptional transparency; a well-defined hexagonal prism of Dauphiné habit with a sharp, undamaged termination. The faces of the main prism alternate between completely clean surfaces and others lightly satin from stepped growth. At the base of its longest face, a small cluster of secondary microcrystals is attached. A clean, all-round 360° piece.
History of this specimen
I passed on it at first, but it reappeared later and ended up in my collection.
About Cuarzo
Quartz is an abundant tectosilicate that crystallises in the trigonal system. Arkansas rock crystal is recognised by its great clarity, very regular horizontal striations on prism faces, and well-developed terminations with combinations of rhombohedra.
About the locality
The Collier Creek Mine, at Mount Ida (Montgomery County, Arkansas), is a classic locality for highly transparent rock crystal. Many specimens show tall prisms with pronounced striations and well-formed secondary growths at the base, features distinctive of this region since the late 20th century.
Technical data
- Catalogue No.
- 0323
- Composition
- SiO₂
- Name
- Cuarzo
- Variety
- Cristal de roca
- Group
- Silicatos [Tectosilicatos (Grupo Cuarzo)]
- Category
- Estélites
- Mine
- Collier Creek Mine
- District / Municipality
- Mount Ida
- Province
- Montgomery County
- Region
- Arkansas
- Country
- Estados Unidos
- Size (cm)
- 8 x 3 x 3
- Weight
- 75.3 g
- Acquired
- 2001
- Etymology
- From German "Quarz", of uncertain origin, perhaps from Slavic "tvurdŭ" (hard).
- Quality
- Muy buena
- Value trend
- Al alza
Related specimens
- Analcima — Estados Unidos
- Auricalcita — Estados Unidos
- Boltwoodita — Estados Unidos
- Calcita (Ahumada) — Estados Unidos
- Calcita — Estados Unidos
- Calcita — Estados Unidos
- Carnotita — Estados Unidos
- Coffinita — Estados Unidos