Thortveitite
Sc₂Si₂O₇
Silicates
Hardness —
· Monoclinic
Photo: Didier Descouens · CC BY-SA 4.0
Neptunite
Na₂KLiFe²⁺₂Ti₂Si₈O₂₄
Transitional structure between phyllosilicate and other silicate unit, mineral
Properties
- Chemical formula
- Na₂KLiFe²⁺₂Ti₂Si₈O₂₄
- Group
- Silicates
- Crystal system
- Monoclinic
- Hardness (Mohs)
- —
- Color
- Black
- Luster
- —
- Streak
- —
- Density
- —
- Cleavage
- —
- Fracture
- —
- Tenacity
- —
- Crystal habit
- —
- Transparency
- —
- Space group
- Cc
- Fluorescence
- —
- Magnetism
- —
- Radioactivity
- —
- Refractive index
- —
- Optical character
- —
- Birefringence
- —
- Pleochroism
- —
- Strunz classification
- 9.EH.05
- Dana classification
- 70.4.1.1
- IMA status
- Grandfathered mineral (G)
- IMA symbol
- Npt
- Locality
- 🇬🇱 Narsaarsuk pegmatite
- Type locality
- —
- Discovery year
- —
Etymology
Named after Neptune
Source: Wikidata
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