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Cuspidine Mineral Data

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General Cuspidine Information

Help on Chemical  Formula: Chemical Formula: Ca4Si2O7(F,OH)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca4Si2O7F1.5(OH)0.5
Help on Environment: Environment: Ejected masses from Mte. Somma, Vesuvius.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1876
Help on Locality: Locality: At Monte Somma and Vesuvius, Campania, and in the Alban Hills, as at Ariccia, Lazio, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek cuspis, for a spear, the characteristic shape of the twinned crystals.
Help on Synonym: Synonym: Custerite
  ICSD 34339
  PDF 41-1474
 

Cuspidine Image

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  Cuspidine

Comments: Tan spear-shaped micro crystals of cuspidine in diopside.
Location: San Vito Quarry, Vesuvius, Napoli, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Jasmundite   Cuspidine

Comments: Tan-brownish crystals of jasmundite and dark green cuspidine with gehlenite and spinel in matrix.
Location: Bellerberg, Eifel, Germany. Scale: Not Given.
© Diederik Visser

Cuspidine Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.034:1:0.7161
Help on Cell Dimensions: Cell Dimensions: a = 10.93, b = 10.57, c = 7.57, Z = 4; beta = 110.1° V = 821.30 Den(Calc)= 2.96
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.062(1), 2.943(0.35), 3.259(0.3),
 

Physical Properties of Cuspidine

Help on Cleavage: Cleavage: {001} Good, {110} Imperfect
Help on Color: Color: Colorless, Green, White, Light pink.
Help on Density: Density: 2.8 - 2.9, Average = 2.84
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Cuspidine

Help on Gladstone-Dale: 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
Ncalc = 1.57 - 1.61
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.95 gm/cc
note: Specific Gravity of Cuspidine =2.96 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0079273277
Boson Index = 0.9920726723
Help on Photoelectric: Photoelectric: PECuspidine = 6.02 barns/electron
U=PECuspidine x rElectron Density= 17.74 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cuspidine is Not Radioactive
 

Cuspidine Classification

Help on  Dana Class: Dana Class: 56.02.04.03 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.04)Cuspidine - Wohlerite group
 
56.02.04.01 Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m
 
56.02.04.02 Burpalite Na2CaZrSi2O7F2 P 21/a 2/m
 
56.02.04.03 Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m
 
56.02.04.04 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m
 
56.02.04.05 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m
 
56.02.04.06 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
 
56.02.04.07 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
 
56.02.04.08 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
 
56.02.04.09 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
 
56.02.04.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m
 
56.02.04.11 Jennite Ca9Si6O18(OH)6•8H2O P1 1
 
56.02.04.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho
 
56.02.04.13 Natrokomarovite* Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m
 
56.02.04.14 Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2
 
56.02.04.15 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra
 
56.02.04.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1
 
56.02.04.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1
 
56.02.04.18 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m
Help on  Strunz Class: Strunz Class: 09.BE.17 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.17 Baghdadite Ca3(Zr,Ti)Si2O9 P 21/a 2/m
 
09.BE.17 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21/n 2/m
 
09.BE.17 Burpalite Na2CaZrSi2O7F2 P 21/a 2/m
 
09.BE.17 Cuspidine Ca4Si2O7(F,OH)2 P 21/c 2/m
 
09.BE.17 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
 
09.BE.17 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21/a 2/m
 
09.BE.17 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
 
09.BE.17 Normandite! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 21/a 2/m
 
09.BE.17 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21/m 2/m
 
09.BE.17 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m
 

Other Cuspidine Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: 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 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Cuspidine

Ca4Si2O7(F,OH)2
Dana No: 56.02.04.03 Strunz No: 09.BE.17
Locality:

 

Notes:

 

 
   
 


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