میلیلیت
Sign in to savethumb|300px|right|A view down onto the sheets of the A2B(T2O7) melilite structure. The A sites are yellow spheres, the B sites are pale orange tetrahedra, and the T sites are blue tetrahedra. Oxygen atoms (not shown) are on the corners of the tetrahedra.
Key facts
- Mineral.name
- Melilite
- Mineral.category
- Sorosilicates
- Mineral.image
- Melilite (GeoDIL number - 1968).jpg
- Mineral.caption
- Melilite – each of the pieces is about 1 cm across
- Mineral.strunz
- 9.BB.**
- Mineral.formula
- {{chem2|(Ca,Na)2(Al,Mg,Fe^{2+})[(Al,Si)SiO7]}}
- Mineral.color
- Yellowish, greenish brown
- Mineral.habit
- Massive – granular
- Mineral.system
- Tetragonal
- Mineral.symmetry
- P21m (no. 113)
- Mineral.cleavage
- Distinct on {001}, weak on {110}
- Mineral.fracture
- Uneven
- Mineral.mohs
- 5–5.5
- Mineral.luster
- Vitreous – greasy
- Mineral.streak
- white
- Mineral.diaphaneity
- Translucent
- Mineral.gravity
- 2.9–3.0
- Mineral.opticalprop
- Uniaxial (−)
via Wikipedia infobox