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Defernite

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Jacques Deferne
Formula:
Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)
Colour:
Colourless (original occurrance), also deep red, rose-brown
Lustre:
Sub-Vitreous, Waxy
Hardness:
3
Specific Gravity:
2.34 - 2.5
Crystal System:
Orthorhombic
Name:
Named by Halil Sarp, M. F. Taner, Jacques Deferne, Helene Bizouard, and B. W. Liebich in 1980 in honor of Jacques Deferne, Curator of Mineralogy, Museum of Natural History, Geneva, Switzerland.
This page provides mineralogical data about Defernite.


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Classification of DeferniteHide

Approved
Approval Year:
1978
5.BA.25

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
16b.4.2.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:1
12.1.5

12 : Carbonates with other anions
1 : Carbonates with halides

Physical Properties of DeferniteHide

Sub-Vitreous, Waxy
Transparency:
Transparent
Colour:
Colourless (original occurrance), also deep red, rose-brown
Comment:
Red to rose brown colors probably due to Mn
Streak:
Colorless, also Pink
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
perfect {010} and distinct {100}
Fracture:
Splintery, Conchoidal
Density:
2.34 - 2.5 g/cm3 (Measured)    2.31 g/cm3 (Calculated)
Comment:
Calculated D = 2.42 from type locaity

Optical Data of DeferniteHide

Type:
Biaxial (-)
RI values:
nα = 1.546 nβ = 1.572 nγ = 1.576
2V:
Measured: 42° , Calculated: 42°
Birefringence:
0.030
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
medium r < v (Turkey)
Optical Extinction:
Parallel. X = c, Y = b
Pleochroism:
Strong
Comments:
X = ochre-brown,
Y= brownish-orange to ochre-brown,
Z= colorless to yellow

Chemical Properties of DeferniteHide

Formula:
Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)
IMA Formula:
Ca6(CO3)1.58(Si2O7)0.21(OH)7[Cl0.50(OH)0.08(H2O)0.42]
Common Impurities:
Fe,Mn,Mg

Crystallography of DeferniteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 17.860 Å, b = 22.775 Å, c = 3.658 Å
Ratio:
a:b:c = 0.784 : 1 : 0.161
Unit Cell V:
1,487.93 ų (Calculated from Unit Cell)
Z:
8
Morphology:
idiomorphic "porphyroblastic" laths
Comment:
space group Pna2, or Pnam

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.37 (100)
8.29 (35)
5.68 (30)
3.045 (40)
2.899 (50)
2.418 (35)
1.962 (35)
1.825 (40)
Comments:
Sarp et al. (1980)

Type Occurrence of DeferniteHide

Place of Conservation of Type Material:
Museum of Natural History, Geneva, Switzerland, 435/30; National Museum of Natural History, Washington, D.C., USA, 163241. Cotype material in NHM Vienna collection (M 5134).
Geological Setting of Type Material:
Secondary alteration product of high-temperature calc-silicates
Associated Minerals at Type Locality:

Synonyms of DeferniteHide

Other Language Names for DeferniteHide

German:Defernit
Spanish:Defernita

Common AssociatesHide

HausmanniteMn2+Mn3+2O4
Associated Minerals Based on Photo Data:
Hematite6 photos of Defernite associated with Hematite on mindat.org.
Magnetite1 photo of Defernite associated with Magnetite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.BA.05AzuriteCu3(CO3)2(OH)2Mon. 2/m : P21/b
5.BA.10GeorgeiteCu2(CO3)(OH)2 · 6H2OAmor.
5.BA.10Glaukosphaerite(Cu,Ni)2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10Kolwezite(Cu,Co)2(CO3)(OH)2Tric.
5.BA.10MalachiteCu2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10Mcguinnessite(Mg,Cu)2(CO3)(OH)2
5.BA.10NullaginiteNi2(CO3)(OH)2Mon.
5.BA.10PokrovskiteMg2(CO3)(OH)2Mon.
5.BA.10Rosasite(Cu,Zn)2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10Zincrosasite(Zn,Cu)2(CO3)(OH)2Mon.
5.BA.10ChukanoviteFe2+2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.15Aurichalcite(Zn,Cu)5(CO3)2(OH)6Mon. 2/m : P21/m
5.BA.15HydrozinciteZn5(CO3)2(OH)6Mon. 2/m : B2/m
5.BA.20HoldawayiteMn6(CO3)2(OH)7(Cl,OH)Mon. 2/m : B2/m
5.BA.25UM1977-03-COSiO:CaClHCa10-11(CO3)7(SiO4)Cl1-2(OH)1-2Mon.
5.BA.30Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10Mon. 2/m
5.BA.30Sclarite(Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10Mon. 2/m : B2/b

Related Minerals - Dana Grouping (8th Ed.)Hide

16b.4.2.2HoldawayiteMn6(CO3)2(OH)7(Cl,OH)Mon. 2/m : B2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

12.1.1NorthupiteNa3Mg(CO3)2ClIso. m3 (2/m 3) : Fd3
12.1.2BarentsiteNa7Al(HCO3)2(CO3)2F4Tric.
12.1.3RouvilleiteNa3(Ca,Mn,Fe)2(CO3)3FMon. 2/m : B2/b
12.1.4ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2OHex.
12.1.6BrenkiteCa2(CO3)F2Orth.
12.1.7Stenonite(Sr,Ba,Na)2Al(CO3)F5Mon. 2/m
12.1.8Bastnäsite-(Ce)Ce(CO3)FHex. 6 m2 : P6c2
12.1.9Bastnäsite-(La)La(CO3)FHex.
12.1.10Bastnäsite-(Y)Y(CO3)FHex. 6 m2 : P62c
12.1.11Parisite-(Ce)CaCe2(CO3)3F2Mon. m : Bb
12.1.12Parisite-(Nd)Ca(Nd,Ce,La)2(CO3)3F2
12.1.13Synchysite-(Ce)CaCe(CO3)2FMon. 2/m : B2/b
12.1.14Synchysite-(Y)CaY(CO3)2FMon. 2/m : B2/b
12.1.15Synchysite-(Nd)CaNd(CO3)2F
12.1.16Röntgenite-(Ce)Ca2(Ce,La)3(CO3)5F3Trig. 3 : R3
12.1.17Cordylite-(Ce)NaBaCe2(CO3)4F Hex.
12.1.19Huanghoite-(Ce)BaCe(CO3)2FTrig. 3m (3 2/m) : R3m
12.1.20Zhonghuacerite-(Ce)Ba2Ce(CO3)3FTrig.
12.1.21Cebaite-(Ce)Ba3Ce2(CO3)5F2
12.1.22ThorbastnäsiteThCa(CO3)2F2 · 3H2O
12.1.23PhosgenitePb2CO3Cl2Tet. 4/mmm (4/m 2/m 2/m) : P4/mbm
12.1.24BarstowitePb4Cl6(CO3) · H2OMon. 2/m : P21/m
12.1.25AlbrechtschraufiteCa4Mg(UO2)2(CO3)6F2 · 17-18H2OTric. 1 : P1
12.1.26KettneriteCaBiCO3OFOrth. mmm (2/m 2/m 2/m)

Other InformationHide

Notes:
Dissolves in l:l HCl with effervescence
Special Storage/
Display Requirements:
On exposure, the cleavage surfaces of defernite laths develop a whitish patina.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for DeferniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sarp, H., M.F. Taner, J. Deferne, H. Bizouard, and B.W. Liebich (1980): La defernite, Ca6(CO3)2(OH;Cl)8 nH2O; un nouveau carbonate de calcium chloro-hydroxylé. Bull. Minéral., 103, 185-189 (in French).
American Mineralogist: 65: 1066.
Liebich, B. W. & Sarp, H. (1985): La structure cristalline de la defernite. Schweizerische Mineralogische und Petrographische Mitteilungen, 65, 153-158 (in French).
Peacor, D.R., H. Sarp, P.J. Dunn, J. Innes, and J.A. Nelen (1988): Defernite from the Kombat mine, Namibia: a second occurrence, structure refinement, and crystal chemistry. Amer. Mineral., 73, 888-893.
Armbruster, T., Yang, P., Liebich, B. W. (1996): Mechanism of the SiO4 for CO3 substitution in defernite, Ca6(CO3)1.58(Si2O7)0.21(OH)7[Cl0.50(OH)0.08(H2O)0.42]: a single-crystal X-ray study at 100 K. American Mineralogist, 81, 625-631.

Internet Links for DeferniteHide

Localities for DeferniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
Dunn, P.J. (1991), Rare minerals of the Kombat Mine, Mineralogical Record: 22(6): 421-425. American Mineralogist, Volume 73, pages 888-893, 1988
Turkey (TL)
 
  • Black Sea Region
    • Rize Province
Bull.Soc.fr.Min.Crist.(1980) 103, 185-189; Sarp H, Burri G (1987) Yeni bir mineral, trabzonit, Ca4 Si3 O10 2H2O. Bulletin of the Geological Society of Turkey 30, 57-60
Mineral and/or Locality  
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