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Defernite Mineral Data

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General Defernite Information

Help on Chemical  Formula: Chemical Formula: Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x=0,5)
Help on Composition: Composition: Molecular Weight = 521.80 gm
   Calcium   46.08 %  Ca   64.48 % CaO
   Silicon    2.69 %  Si    5.76 % SiO2
   Hydrogen   1.45 %  H    12.95 % H2O
   Carbon     3.45 %  C    12.65 % CO2
   Chlorine   3.40 %  Cl    3.40 % Cl
               -   %   Cl   -0.77 % -O=Cl2   
   Oxygen    42.93 %  O
            ______        ______ 
            100.00 %       98.47 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca6(CO3)1.5(SiO4)0.5(OH)7.5Cl0.5
Help on Environment: Environment: Skarn at a granite-limestone contact
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Gauneyce-Ikizdere area, Trabzon Province, Turkey. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Jacques Deferne, Curator of Mineralogy, Museum of Natural History, Geneva, Switzerland.
Help on Name Pronunciation: Name Pronunciation: Defernite + Pronunciation Say DEFERNITE
Help on Synonym: Synonym: ICSD 81638
  PDF 42-1324

Defernite Image

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  Defernite   Hematite

Comments: Specular hematite rich with crystalline grains of reddish brown defernite.
Location: Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia. Scale: 3.9 x 2.5 cm.
© John Veevaert

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  Vaterite   Defernite   Manganite

Comments: Opaque white fibrous vaterite with red defernite and black manganite.
Location: Kombat Mine, Otavi, Otjozondjupa, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Defernite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7829:1:0.1594
Help on Cell Dimensions: Cell Dimensions: a = 17.82, b = 22.76, c = 3.629, Z = 4; V = 1,471.86 Den(Calc)= 2.35
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11.37(1), 2.899(0.5), 3.045(0.4),

Physical Properties of Defernite

Help on Cleavage: Cleavage: {010} Perfect, {100} Distinct
Help on Color: Color: Colorless, Reddish brown.
Help on Density: Density: 2.5
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Defernite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2403,KPDmeas= 0.2259,KC= 0.2288
Ncalc = 1.54 - 1.57
Help on Optical Data: Optical Data: Biaxial (-), a=1.546, b=1.572, g=1.576, bire=0.0300, 2V(Calc)=42, 2V(Meas)=42.

Calculated Properties of Defernite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.53 gm/cc
note: Specific Gravity of Defernite =2.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0024669373
Boson Index = 0.9975330627
Help on Photoelectric: Photoelectric: PEDefernite = 5.99 barns/electron
U=PEDefernite x rElectron Density= 15.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Defernite is Not Radioactive

Defernite Classification

Help on  Dana Class: Dana Class: 16b.04.02.01 (16b)Carbonates - Hydroxyl or Halogen
  (16b.04)where (A)m (B)n (XO3)p Zq � x(H2O), with (m+n):p=8:1
  (16b.04.02)Dana Group
16b.04.02.01 Defernite Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x(x=0,5) Pnam 2/m 2/m 2/m
16b.04.02.02 Holdawayite Mn6(CO3)2(OH)7(Cl,OH) C 2/m 2/m
Help on  Strunz Class: Strunz Class: 05.BA.25 05 - CARBONATES (NITRATES)
  05.B - Carbonates with additional anions, without H2O
  05.BA -With Cu, Co, Ni, Zn, Mg, Mn
05.BA.25 Defernite Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x(x=0,5) Pnam 2/m 2/m 2/m

Other Defernite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Defernite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Defernite Specimen Label here :


Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x=0,5)
Dana No: 16b.04.02.01 Strunz No: 05.BA.25





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