Mineralpedia Details for Janhaugite
Janhaugite
Named for Jan Haug, an amateur mineralogist who was the first to observe the mineral. Janhaugite occurs in groundmass and crystal lined cavities in sodium- rich granites. It is a rare mineral that can be found only in Norway at its type locality at Gjerdingselva and in the Khibiny Massif in the Kola Peninsual of Russia. Associated minerals include pyrophanite, elpidite, monazite, dalyite, and kupletskite.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/janhaugite.pdf
- Formula
- (Na,Ca)3(Mn2+,Fe2+)3(Ti,Zr,Nb)2(Si2O7)2O2(OH,F)2
- Crystal System
- Monoclinic
- Crystal Habit
- Prismatic, Striated, Anhedral Grains
- Cleavage
- Distinct, None, None
- Luster
- Vitreous (Glassy)
- Color
- reddish brown
- Streak
- light brown
- Class
- Monoclinic - Prismatic
- Fracture
- Brittle
- Hardness
- 5
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Janhaugite from Gjerdingselva, Nordmarka, Lunner, Oppland, Norway
Amber colored prismatic crystals as singles and groups.
Click thumbnail images for larger view.
