Defernite Mineral Data

Advertisment

WE BUY COLLECTIONS & SINGLE IMPORTANT SPECIMENS

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Defernite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Defernite :

A Bijoux Google Search for Defernite
Adam's Minerals Google Search for Defernite
Cape Minerals Google Search for Defernite
Dakota Matrix Minerals Google Search for Defernite
Excalibur Mineral Corp. Google Search for Defernite
Exceptional Minerals Google Search for Defernite
John Betts Fine Minerals Search for Defernite
McDougall Minerals Google Search for Defernite
Mineral News Website Link
Rock and Mineral Shows Google Search for Defernite
Weinrich Minerals, Inc. Google Search for Defernite

Ask about Defernite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: