File:Opal-53714.jpg · Wikimedia Commons · See Wikimedia Commons
AI overview
Opal is a gemstone prized for its distinctive play of colors and is mined in several countries around the world, with Australia, Ethiopia, Brazil, Mexico, and the United States being the primary producers. It matters because it is valued as a precious stone used in jewelry and decorative items.
AI-generated from the Wikipedia summary — may contain errors.
Key facts
- Mineral.fluorescence
- black or white body color: inert to white to moderate light blue, green, or yellow in long and short wave, may also phosphoresce, common opal: inert to strong green or yellowish green in long and short wave, may phosphoresce; fire opal: inert to moderate greenish brown in long and short wave, may phosphoresce
- Mineral.absorption
- green stones: 660 nm, 470 nm cutoff
- Mineral.streak
- White
- Mineral.density
- 2.09 g/cm3
- Mineral.diagnostic
- darkening upon heating
- Mineral.solubility
- hot salt water, bases, methanol, humic acid, hydrofluoric acid
- Mineral.diaphaneity
- opaque, translucent, transparent
- Mineral.name
- Opal
- Mineral.category
- Mineraloid
- Mineral.boxbgcolor
- 5cc4e7
- Mineral.image
- Opal-53714.jpg
Article · Português
O mineraloide opala é sílica amorfa hidratada, cujo percentual de água pode chegar a 20%. Por ser amorfo, ele não tem formato de cristal, ocorrendo em veios irregulares, massas, e nódulos. Tem a fratura conchoidal, brilho vítreo, dureza na escala de Mohs de 5,5-6,6, gravidade específica 2,1-2,3, e uma cor altamente variável.
Abstract from DBpedia / Wikipedia · CC BY-SA