Magnesiohastingsite
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Magnesiohastingsite is a calcium-containing amphibole and a member of the hornblende group.[5] It is an inosilicate (chain silicate) with the formula NaCa2(Mg4Fe3+)(Si6Al2)O22(OH)2[1] and molar mass 864.69 g.[2] In synthetic magnesiohastingsite it appears that iron occurs both as ferrous iron Fe2+ and as ferric iron Fe3+, but the ideal formula features only ferric iron.[9] It was named in 1928 by Marland P. Billings. The name is for its relationship to hastingsite and its magnesium content. Hastingsite was named for the locality in Dungannon Township, Hastings County, Ontario, Canada.[4]
Quick Facts General, Category ...
Magnesiohastingsite | |
---|---|
General | |
Category | Amphibole |
Formula (repeating unit) | NaCa2(Mg4Fe3+)(Si6Al2)O22(OH)2[1] |
Strunz classification | 9.DE.15 (10 ed) 8/F.10-130 (8 ed) |
Dana classification | 66.01.03a.14 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/m |
Identification | |
Formula mass | 864.69 g/mol[2] |
Color | Green to dark green or black |
Twinning | Simple or multiple twinning parallel to {100}[3] |
Cleavage | Good on {110} with intersections at about 56° and 124°. Partings on {001}, {100}[3] |
Tenacity | Brittle |
Mohs scale hardness | 5 to 6 |
Luster | Vitreous |
Streak | Pale grey-green to pale brownish-green[4] |
Diaphaneity | Subopaque |
Specific gravity | 3.16 to 3.22 |
Optical properties | Biaxial (-) |
Solubility | Insoluble in HCl[5] |
Other characteristics | Not radioactive |
References | [6][2][3][4][7][1][5][8] |
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Calcic (containing calcium) amphiboles include:[5]
- The tremolite – actinolite – ferro-actinolite series
- The hornblende group
- The kaersutite – ferro-kaersutite series
- Joesmithite
The hornblende group includes:[5]
- The edenite – ferro-edenite series
- The tschermakite – ferrotschermakite series
- The pargasite – ferro-pargasite series
- The magnesiohastingsite – hastingsite series
- The magnesiosadanagaite – sadanagaite series