| Cuspidine Mineral Data |
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- 56.2.4.1 Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m
- 56.2.4.2 Burpalite Na2CaZrSi2O7F2 P 21/a 2/m
- 56.2.4.3 Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m
- 56.2.4.4 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m
- 56.2.4.5 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m
- 56.2.4.6 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
- 56.2.4.7 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
- 56.2.4.8 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
- 56.2.4.9 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
- 56.2.4.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m
- 56.2.4.11 Jennite Ca9Si6O18(OH)6·8H2O P1 1
- 56.2.4.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2·3.5(H2O) Unk Ortho
- 56.2.4.13 Na-komarovite? Na6CaNb6[Si4O12F2·4(H2O) C mmm 2/m 2/m 2/m
- 56.2.4.14 Suolunite Ca2Si2O5(OH)2·(H2O) F dd2 mm2
- 56.2.4.15 Mongolite Ca4Nb6Si5O24(OH)10·5(H2O) Unk Tetra
- 56.2.4.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1
- 56.2.4.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1
- VIII/C.11-05 Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m
- VIII/C.11-10 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m
- VIII/C.11-12 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m
- VIII/C.11-15 Normandite! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 21/a 2/m
- VIII/C.11-20 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m
- VIII/C.11-25 Burpalite Na2CaZrSi2O7F2 P 21/a 2/m
- VIII/C.11-30 Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m
- VIII/C.11-40 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
- VIII/C.11-50 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
General Cuspidine Information |
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 Chemical Formula: |
Ca4Si2O7(F,OH)2 | ||
| Composition: |
Molecular Weight = 365.48 gm | ||
| Calcium 43.86 % Ca 61.37 % CaO | |||
| Silicon 15.37 % Si 32.88 % SiO2 | |||
| Hydrogen 0.14 % H 1.23 % H2O | |||
| Oxygen 32.83 % O | |||
| Fluorine 7.80 % F 7.80 % F | |||
| - % F -3.28 % -O=F2 | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ca4Si2O7F1.5(OH)0.5 | ||
| IMA Status: |
Valid Species (Pre-IMA) 1876 | ||
| Locality: |
Ejected masses from Mte. Somma, Vesuvius. Link to MinDat.org Location Data. | ||
| Synonym: |
Custerite | ||
| ICSD 34339 | |||
| PDF 41-1474 | |||
Cuspidine Image | |||
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Images:
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Cuspidine Crystallography |
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| Axial Ratios: |
a:b:c =1.034:1:0.7161 | ||
| Cell Dimensions: |
a = 10.93, b = 10.57, c = 7.57, Z = 4; beta = 110.1° V = 821.30 Den(Calc)= 2.96 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.062(1), 2.943(0.35), 3.259(0.3), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Cuspidine |
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| Cleavage: |
[001] Good, [110] Imperfect | ||
| Color: |
Colorless, Green, White, Light pink. | ||
| Density: |
2.8 - 2.9, Average = 2.84 | ||
| Diaphaniety: |
Transparent | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Habit: |
Acicular - Occurs as needle-like crystals. | ||
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. | ||
| Hardness: |
5-6 - Between Apatite and Orthoclase | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous (Glassy) | ||
| Magnetism: |
Nonmagnetic | ||
| Streak: |
white | ||
Optical Properties of Cuspidine |
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| Gladstone-Dale: |
CI meas= -0.019 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2012,KPDmeas= 0.2089,KC= 0.2051 |
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| Optical Data: |
Biaxial (+), a=1.586-1.592, b=1.595-1.596, g=1.598-1.606, bire=0.0120-0.0140, 2V(Calc)=58-66, 2V(Meas)=63. Dispersion r > v distinct. | ||
Calculated Properties of Cuspidine |
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| Electron Density: |
relectron=2.95 gm/cc |
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| Fermion Index |
Fermion Index = 0.00792 Boson Index = 0.99208 |
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| Photoelectric: |
PECuspidine = 6.02 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cuspidine is Not Radioactive |
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Cuspidine Classification |
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| Dana Class: |
56.2.4.3 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O | ||
| (56.2)with cations in [4] and/or >[4] coordination | |||
| (56.2.4)Cuspidine - Wohlerite group | |||
| Strunz Class: |
VIII/C.11-05 VIII - Silicates | ||
| VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F] | |||
| VIII/C.11 - Wöhlerite - Lavenite series | |||
Other Cuspidine Information |
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| References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | ||
| See Also: |
Links to other databases for Cuspidine : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - Franklin Minerals(Dunn) 6 - Franklin Minerals(Palache) 7 - Google Images 8 - Google Scholar 9 - Handbook of Mineralogy (MinSocAm) 10 - Handbook of Mineralogy (UofA) 11 - MinDAT 12 - MinMax(Deutsch) 13 - MinMax(English) 14 - Mineralienatlas (Deutsch) 15 - QUT Mineral Atlas 16 - Ruff.Info 17 - WWW-MINCRYST Search for Cuspidine using: Visit our Advertisers for Cuspidine : AA Mineral SpecimensB & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals The GeoZone Wrights Rock Shop Translate Cuspidine Mineral Data : Ask about Cuspidine here : Print or Cut-and-Paste your Cuspidine Specimen Label here :
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