Harmotome
Mineral (Ba,K)1-2(Si,Al)8O16·6H2O
About it
A barium zeolite known for cross-shaped twins in hydrothermal veins and basalt; heavier than other zeolites. Classic from Strontian, Scotland, and St. Andreasberg, Germany.
- Type
- Mineral
- Group
- Silicate (tectosilicate), zeolite group
- Formula
- (Ba,K)1-2(Si,Al)8O16·6H2O
- Hardness (Mohs)
- 4.5
- Specific gravity
- 2.41–2.47
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- colourless, white, grey, yellow, pink, brown
- Transparency
- transparent, translucent
- Cleavage and fracture
- distinct in one direction
Typical values: real specimens vary. For more, see mindat.org.