Mineralpedia Details for Ahlfeldite
Ahlfeldite
Named for Friedrich E. Ahlfeld, a German-Bolivian mining engineer and mineralogist. Ahlfeldite is a rare mineral that can be found only in Bolivia at the Virgen de Surumi mine, its type locality, and at the El Dragon mine, both in the Potosi Department. Ahlfeldite is an “alteration product of nickel-bearing selenides and sulfides” in association with perroseite, chalcomenite, olsacherite, cerussite, anglesite, lepidocrocite, and goethite.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/ahlfeldite.pdf
- Formula
- NiSe4+O3ยท2H2O
- Crystal System
- Monoclinic
- Crystal Habit
- Prismatic
- Cleavage
- Distinct, Distinct, None
- Luster
- Vitreous (Glassy)
- Color
- pink brown, apple green, red
- Streak
- light green
- Class
- Monoclinic - Prismatic
- Fracture
- Brittle
- Hardness
- 2-2.5
- WebMineral
- View Ahlfeldite
- Mindat
- View Ahlfeldite
Ahlfelfite (cobaltoan) from Heaco Mine, Colquehaca, Bolivia
Pink cobaltoan rich Ahlfeldite crystals lining several vugs in Penroseite matrix with white Molybdomenite crystals to about 0.75mm.
Well-formed crystals of cobalt-rich Ahlfeldite crystals explaining the pink color. Glassy crystals in many open vugs in Penroseite matrix.
