Defernite Mineral Data

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General Defernite Information

Chemical Formula:

Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x=0,5)

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

Empirical Formula:

Ca₆(CO₃)_1.5(SiO₄)_0.5(OH)_7.5Cl_0.5

Environment:

Skarn at a granite-limestone contact

IMA Status:

Approved IMA 1978

Locality:

Gauneyce-Ikizdere area, Trabzon Province, Turkey. Link to MinDat.org Location Data.

Name Origin:

Named for Jacques Deferne, Curator of Mineralogy, Museum of Natural History, Geneva, Switzerland.

Name Pronunciation:

Defernite + Pronunciation

Synonym:

ICSD 81638

PDF 42-1324

Defernite Image

Images:

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

Images:

Defernite Vaterite 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

Axial Ratios:

a:b:c =0.7829:1:0.1594

Cell Dimensions:

a = 17.82, b = 22.76, c = 3.629, Z = 4; V = 1,471.86 Den(Calc)= 2.35

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 11.37(1), 2.899(0.5), 3.045(0.4),

Crystal Structure:

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Peacor D R , Sarp H , Dunn P J , Innes J , Nelen J A , American Mineralogist , 73 (1988) p.888-893, Defernite from the Kombat mine, Namibia: A second occurence, structure, refinement, and crystal chemistry

View Additional jPOWD Structure files for Defernite
[1]

Physical Properties of Defernite

Cleavage:

{010} Perfect, {100} Distinct

Color:

Colorless, Reddish brown.

Density:

2.5

Diaphaneity:

Transparent

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Defernite

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

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

Electron Density:

Bulk Density (Electron Density)=2.53 gm/cc
note: Specific Gravity of Defernite =2.50 gm/cc.

Fermion Index:

Fermion Index = 0.0024669373
Boson Index = 0.9975330627

Photoelectric:

PE_Defernite= 5.99 barns/electron
U=PE_Defernite x rElectron Density= 15.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Defernite is Not Radioactive

Defernite Classification

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

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

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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

Defernite

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
Locality:

Notes: