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Unnamed (Ca-analogue of Humite)

Invalid as an unnamed mineral
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Formula:
Ca7(SiO4)4F2
Crystal System:
Orthorhombic
Member of:
Humite Group
F-dominant analogue of Chegemite.


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Unique IdentifiersHide

Mindat ID:
39698
Long-form identifier:
mindat:1:1:39698:5

IMA Classification of Unnamed (Ca-analogue of Humite)Hide

IMA status notes:
Unnamed (probably invalid)
Approval history:
Unnamed, and probably invalid.

Classification of Unnamed (Ca-analogue of Humite)Hide

Strunz-mindat (2026):
9.AF.50

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Dana 8th ed.:
52.3.4.5

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only

Chemistry of Unnamed (Ca-analogue of Humite)Hide

Mindat Formula:
Ca7(SiO4)4F2
Element Weights:
Element% weight
Ca40.844 %
O37.269 %
Si16.356 %
F5.532 %

Calculated from ideal end-member formula.
Elements listed:
Ca, F, O, Si - search for minerals with similar chemistry

Crystallography of Unnamed (Ca-analogue of Humite)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 5.0696(1) Å, b = 11.3955(1) Å, c = 23.5571(3) Å
Ratio:
a:b:c = 0.445 : 1 : 2.067
Unit Cell V:
1360.92 ÅÂģ
Z:
4
Comment:
Space group: Pbnm

Relationship of Unnamed (Ca-analogue of Humite) to other SpeciesHide

Member of:
Humite Group
Other Members of Humite Group:
Chegemite SubgroupCa2nSinO4n · Ca(OH,F)2, n = 2,3,4
Humite Subgroupn[Mg2(SiO4)] · Mg(OH,F)2 with n = 1, 2, 3, or 4
Leucophoenicite SubgroupThe leucophoenicite Subgroup minerals are unit cell-twinned polymorphs of the corresponding humite-group minerals.
Manganhumite SubgroupMn2nSinO4n · Mn(OH,F)2, n = 2,3,4

Related Minerals - Strunz-mindat GroupingHide

9.AF.ChegemiteCa7(SiO4)3(OH)2Orth. mmm(2/m2/m2/m)
9.AF.Jingwenite-(Y)YAlV4+(SiO4)O2(OH)2Mon. 2/m
9.AF.BarwooditeMn2+6Nb5+(SiO4)2O3(OH)3Trig. 3 : P3
9.AF.05SillimaniteAl2(SiO4)OOrth. mmm(2/m2/m2/m)
9.AF.05'Xenolite'Al10Si8O31
9.AF.10KanonaiteMn3+Al(SiO4)OOrth. mmm(2/m2/m2/m) : Pnnm
9.AF.10AndalusiteAl2(SiO4)OOrth. mmm(2/m2/m2/m) : Pnnm
9.AF.15KyaniteAl2(SiO4)OTric. 1 : P1
9.AF.20KrieseliteAl2(GeO4)F2Orth. mmm(2/m2/m2/m) : Pnma
9.AF.20MulliteAl4+2xSi2-2xO10-xOrth. mmm(2/m2/m2/m) : Pbam
9.AF.23BoromulliteAl9BSi2O19Orth. mm2 : Cmc21
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)Mon. 2/m : P21/m
9.AF.30ZincostauroliteZn2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.30StauroliteFe2+2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.30MagnesiostauroliteMg(Mg,Li)3(Al,Mg)18Si8O44(OH)4Mon. 2/m : B2/m
9.AF.35TopazAl2(SiO4)(F,OH)2Orth. mmm(2/m2/m2/m)
9.AF.40NorbergiteMg3(SiO4)F2Orth. mmm(2/m2/m2/m)
9.AF.45ChondroditeMg5(SiO4)2F2Mon. 2/m : P21/b
9.AF.45KumtyubeiteCa5(SiO4)2F2Mon. 2/m : P21/b
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.45AlleghanyiteMn2+5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.50HumiteMg7(SiO4)3F2Orth. mmm(2/m2/m2/m) : Pnma
9.AF.50ManganhumiteMn2+7(SiO4)3(OH)2Orth. mmm(2/m2/m2/m)
9.AF.50'Unnamed (OH-analogue of humite)'Mg7(SiO4)3(OH)2Orth.
9.AF.50FluorchegemiteCa7(SiO4)3F2 Orth. mmm(2/m2/m2/m)
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2Mon. 2/m : P21/b
9.AF.55ClinohumiteMg9(SiO4)4F2Mon. 2/m : P21/b
9.AF.55SonoliteMn2+9(SiO4)4(OH)2Mon. 2/m : P21/b
9.AF.60LeucophoeniciteMn2+7(SiO4)3(OH)2Mon. 2/m : P21/b
9.AF.65RibbeiteMn2+5(SiO4)2(OH)2Orth. mmm(2/m2/m2/m)
9.AF.70JerrygibbsiteMn2+9(SiO4)4(OH)2Orth. mmm(2/m2/m2/m) : Pbcn
9.AF.75FranciscaniteMn2+6(V5+,â—ŧ)2(SiO4)2(O,OH)6Trig. 3 : P3
9.AF.75ScorticoiteMn6(Sb,â—ŧ)ÎĢ2(SiO4)2O3(OH)3Trig. 3 : P3
9.AF.75WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 : P3
9.AF.75ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Trig. 3 : P3
9.AF.80EllenbergeriteMg6(Mg,Ti,Zr,â—ŧ)2(Al,Mg)6Si8O28(OH)10Hex. 6 : P63
9.AF.85MagnesiochloritoidMgAl2O(SiO4)(OH)2Mon. 2/m : B2/b
9.AF.85OttrÃĐliteMn2+Al2O(SiO4)(OH)2Mon.
9.AF.85ChloritoidFe2+Al2O(SiO4)(OH)2Mon. 2/m : B2/b
9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)Orth. mmm(2/m2/m2/m) : Pbca
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)Orth. mmm(2/m2/m2/m) : Pbca
9.AF.95Pilawite-(Y)Ca2Y2Al4(SiO4)4O2(OH)2Mon. 2/m : P21/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Unnamed (Ca-analogue of Humite)Hide

References for Unnamed (Ca-analogue of Humite)Hide

Localities for Unnamed (Ca-analogue of Humite)Hide

Showing 1 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Russia
 
  • Kabardino-Balkaria
    • Chegemsky District
      • Upper Chegem volcanic caldera (Verkhnechegemskaya caldera)
Am.Min. 94 (2009)
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