Mineralpedia Details for Mackayite
Mackayite
Named for John William Mackay who was an Irish-American Comstock Lode mining magnate who made an endowment to the School of Mines at the University of Nevada in the United States. Mackayite is a rare mineral that occurs in oxidized cold-tellurium deposits within an alteration product of tellurium. It can be found in the United States, Mexico, and Chile.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/mackayite.pdf
- Formula
- Fe3+Te4+2O5(OH)
- Crystal System
- Tetragonal
- Cleavage
- None, None, None
- Luster
- Vitreous (Glassy)
- Color
- brownish green, yellow green, olive green
- Streak
- light green
- Class
- Tetragonal - Ditetragonal Dipyramidal
- Fracture
- Brittle - Conchoidal
- Hardness
- 4.5
- WebMineral
- View Mackayite
- Mindat
- View Mackayite
Mackayite from Lone Pine mine, Catron Co., New Mexico, United States
Dark green micro crystals to less than 0.5mm filling void.
Click thumbnail images for larger view.
Mackayite from San Miguel mine, Moctezuma, Sonora, Mexico
Glassy green, well-defined crystals to 0.5mm.
Click thumbnail images for larger view.
