Defernite Mineral Data + Say DEFERNITE

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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 IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Link to MinDat.org Location Data.
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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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

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 - DipyramidalH-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),
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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

Help on Cleavage: Cleavage: [010] Perfect, [100] Distinct
Help on Color: Color: Colorless, Reddish brown.
Help on Density: Density: 2.5
Help on Diaphaniety: Diaphaniety: 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
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:

relectron=2.53 gm/cc
note: rDefernite =2.50 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00246
Boson Index = 0.99754
Help on Photoelectric: Photoelectric:

PEDefernite = 5.99 barns/electron
U=PEDefernite x relectron= 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.4.2.1 (16b)Carbonates - Hydroxyl or Halogen
  (16b.4)where (A)m (B)n (XO3)p Zq · x(H2O), with (m+n):p=8:1
  (16b.4.2)Dana Group
 
16b.4.2.1 Defernite Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x(x=0,5) Pnam 2/m 2/m 2/m
 
16b.4.2.2 Holdawayite Mn6(CO3)2(OH)7(Cl,OH) C 2/m 2/m
Help on  Strunz Class: Strunz Class: V/C.06-30 V - Nitrates, Carbonates and Borates
  V/C - Waterfree carbonates with unfamiliar anions
  V/C.06 - Brenkite - Defernite series
 
V/C.06-10 Brenkite Ca2(CO3)F2 P bcn 2/m 2/m 2/m
 
V/C.06-20 Holdawayite Mn6(CO3)2(OH)7(Cl,OH) C 2/m 2/m
 
V/C.06-25 Rouvilleite Na3Ca2(CO3)3F Cc,C 2/c Mono
 
V/C.06-27 Sheldrickite! NaCa3(CO3)2F3·(H2O) P 32 3
 
V/C.06-30 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: 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Defernite

Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x=0,5)
Dana No: 16b.4.2.1 Strunz No: V/C.06-30
Locality:

 

Notes:

 

 
   
 
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