mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Mineralpedia Details for Goyazite

Reset

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

Goyazite
            from Alto Bernardino, Picui, Paraiba, Brazil

Micro crystals to less than 0.5mm.

Click thumbnail images for larger view.

Goyazite from Palermo mine, Groton, Grafton Co., New Hampshire, United States

Goyazite
            from Palermo mine, Groton, Grafton Co., New Hampshire, United States

Pseudocubic white crystals to 1mm.

Click thumbnail images for larger view.

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2021 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map