Mineralpedia Details for Goyazite
Goyazite
Named for the Goyaz, now Goias, state in Brazil. Although the type locality for Goyazite is in Minas Gerais, it is named for the neighboring state. Goyazite is uncommon, but with many localities including in the United States, Canada, Germany, Switzerland, the Democratic Republic of the Congo, Tanzania, Australia, and others. Goyazite occurs in granite pegmatites, hydrothermal argillic alteration zones, kaolinite-rich claystone from volcanic tuff, carbonatites, and as a detrital mineral.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/goyazite.pdf
- Formula
- SrAl3(PO4)(PO3OH)(OH)6
- Crystal System
- Trigonal
- Crystal Habit
- Blocky - Rhombohedral, Disseminated
- Cleavage
- Perfect, None, None
- Luster
- Vitreous - Greasy
- Color
- lemon yellow, pink, colorless
- Streak
- white
- Class
- Trigonal - Hexagonal Scalenohedral
- Fracture
- Uneven
- Hardness
- 4-5
- WebMineral
- View Goyazite
- Mindat
- View Goyazite
Goyazite from Alto Bernardino, Picui, Paraiba, Brazil
Micro crystals to less than 0.5mm.
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Goyazite from Palermo mine, Groton, Grafton Co., New Hampshire, United States
Pseudocubic white crystals to 1mm.
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Goyazite from Rapid Creek, Yukon Territory, Canada
Milky white blacky crystaals to 6mm.
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