Cuspidine Mineral Data (original) (raw)

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

Click Here for Larger Cuspidine Image in a New Browser Window Images:

Click Here for Larger Cuspidine Image in a New Browser Window Images:

Click Here for Larger Cuspidine Image Cuspidine Jasmundite 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 - 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 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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Print or Cut-and-Paste your Cuspidine Specimen Label here :

Cuspidine

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

Notes: