Gibbsite
Al(OH)₃
Oxides
Hardness —
· Monoclinic
Photo: Robert M. Lavinsky · CC BY-SA 3.0
Johannsenite
CaMn²⁺Si₂O₆
Pyroxene mineral
Properties
- Chemical formula
- CaMn²⁺Si₂O₆
- Group
- Oxides
- Crystal system
- Monoclinic
- Hardness (Mohs)
- —
- Color
- Green
- Luster
- —
- Streak
- —
- Density
- —
- Cleavage
- —
- Fracture
- —
- Tenacity
- —
- Crystal habit
- —
- Transparency
- —
- Space group
- C2/c
- Fluorescence
- —
- Magnetism
- —
- Radioactivity
- —
- Refractive index
- —
- Optical character
- —
- Birefringence
- —
- Pleochroism
- —
- Strunz classification
- 9.DA.15
- Dana classification
- 65.1.3a.4
- IMA status
- Approved mineral and/or valid name (A)
- IMA symbol
- Jhn
- Locality
- 🇺🇸 Franklin
- Type locality
- —
- Discovery year
- —
Etymology
Named after Albert Johannsen
Source: Wikidata
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