شیگائیت
Sign in to saveAlso known as IMA1984-057
Shigaite is a mineral with formula NaAl3(Mn2+)6(SO4)2(OH)18·12H2O that typically occurs as small, hexagonal crystals or thin coatings. It is named for Shiga Prefecture, Japan, where it was discovered in 1985. The formula was significantly revised in 1996, identifying sodium as a previously unknown constituent.
Key facts
- Mineral.symmetry
- R
- Mineral.name
- Shigaite
- Mineral.category
- Sulfate mineral
- Mineral.image
- Rhodochrosite-Shigaite-cktsr-4a.jpg
- Mineral.caption
- Reddish-brown shigaite crystal (2 cm across) with pink rhodochrosite from South Africa
- Mineral.formula
- NaAl3(Mn2+)6(SO4)2(OH)18·12H2O
- Mineral.IMAsymbol
- Sga
- Mineral.strunz
- 7.DD.35
- Mineral.dana
- 31.1.2.1
- Mineral.system
- Trigonal
- Mineral.class
- Rhombohedral () H-M symbol: ()
- Mineral.unit cell
- a = 9.51 Å, c = 32.83 Å, Z = 3
- Mineral.color
- Yellow, burnt orange, brown, black
- Mineral.twinning
- On {0001}
- Mineral.cleavage
- Perfect on {0001}
- Mineral.tenacity
- Moderately flexible
- Mineral.mohs
- 2
- Mineral.luster
- Vitreous to dull
via Wikipedia infobox
Wikidata facts
- Named after
- Shiga Prefecture
- Image
- Shigaite-Rhodochrosite-201388.jpg
Show 6 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 7.DD.35
- Nickel-Strunz 9th edition (updated 2009)
- 7.DD.35
- Commons category
- Shigaite
- crystal system
- trigonal crystal system
- IMA Mineral Symbol
- Sga
- chemical formula
- Mn₆Al₃(OH)₁₈[Na(H₂O)₆](SO₄)₂ * 6H₂O
Sources (1)
via Wikidata · CC0