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)7.5Cl0.5
IMA Status:	Approved IMA 1978
Locality:	Link to MinDat.org Location Data.
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
X Ray Diffraction:	By Intensity(I/Io): 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
Diaphaniety:	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
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:	relectron=2.53 gm/cc note: rDefernite =2.50 gm/cc.
Fermion Index	Fermion Index = 0.00246 Boson Index = 0.99754
Photoelectric:	PEDefernite = 5.99 barns/electron U=PEDefernite x relectron= 15.14 barns/cc.
Radioactivity:	GRapi = 0 (Gamma Ray American Petroleum Institute Units) Defernite is Not Radioactive
Defernite Classification
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
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
References:	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 -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 Search for Defernite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Defernite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Defernite Mineral Data : 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.4.2.1 Strunz No: V/C.06-30 Locality:   Notes: