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 IMA Status: IMA Status: Valid Species (Pre-IMA) 1876
Help on Locality: Locality: Ejected masses from Mte. Somma, Vesuvius. Link to MinDat.org Location Data.
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

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 - PrismaticH-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),
Click Here for Large Cuspidine Structure Window Crystal Structure:

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Piotrowski A , Kahlenberg V , Fischer R X , American Mineralogist , 85 (2000) p.1534-1539, Na2Ca2(P2O7)F2, the first diphosphate of the cuspidine family, Sample: single position O1

View Additional jPOWD Structure files for Cuspidine
[1] [2] [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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.95 gm/cc
note: rCuspidine =2.96 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00792
Boson Index = 0.99208
Help on Photoelectric: Photoelectric:

PECuspidine = 6.02 barns/electron
U=PECuspidine x relectron= 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: 56.2.4.3 (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
 
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
Help on Strunz Class: 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
 
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
 

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 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 - WWW-MINCRYST 17 -École des Mines de Paris

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Cuspidine

Ca4Si2O7(F,OH)2
Dana No: 56.2.4.3 Strunz No: VIII/C.11-05
Locality:

 

Notes:

 
 
   
 
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