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Cahnite

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Formula:
Ca2[B(OH)4](AsO4)
Colour:
Colorless to white, also golden brown; colourless in transmitted light.
Lustre:
Vitreous, Sub-Vitreous, Resinous
Hardness:
3
Specific Gravity:
3.156
Crystal System:
Tetragonal
Name:
Named in 1921 by Charles Palache, but not described until 1927 by Charles Palache and Lawson Henry Bauer in honor of Mr. Lazard Cahn [May 23, 1865 Saint Joseph, Missouri, USA - May 22, 1940 Colorado S[rings, Colorado, USA] morphological crystallographer, mineral collector and mineral dealer, who first recognized the material.
Related to Moydite-(Y).


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Classification of CahniteHide

Approved, 'Grandfathered' (first described prior to 1959)
6.AC.70

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
43.4.4.1

43 : COMPOUND PHOSPHATES, ETC.
4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
10.2.2

10 : Borates with other anions
2 : Borates with phosphate or arsenate

Pronounciation of CahniteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of CahniteHide

Vitreous, Sub-Vitreous, Resinous
Transparency:
Transparent, Translucent
Colour:
Colorless to white, also golden brown; colourless in transmitted light.
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
On {110}
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
3.156 g/cm3 (Measured)    3.22 g/cm3 (Calculated)

Optical Data of CahniteHide

Type:
Uniaxial (+)
RI values:
nω = 1.655 - 1.662 nε = 1.656 - 1.663
Birefringence:
0.001
Max Birefringence:
δ = 0.001
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Strong.
Pleochroism:
Non-pleochroic
Comments:
Exhibits abnormal interference colours.

Chemical Properties of CahniteHide

Formula:
Ca2[B(OH)4](AsO4)
IMA Formula:
Ca2B(AsO4)(OH)4

Crystallography of CahniteHide

Crystal System:
Tetragonal
Class (H-M):
4 - Disphenoidal
Space Group:
P4
Cell Parameters:
a = 7.09 Å, c = 6.19 Å
Ratio:
a:c = 1 : 0.873
Unit Cell V:
311.16 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Single untwinned crystals rare, pseudo-tetrahedral habit.
Twinning:
Almost universal on {110}, with the individuals interpenetrating symmetrically. When the sphenoid faces are well-developed, the twins have a characteristic cruciform appearance.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.02 (20)
4.67 (20)
3.56 (100)
2.833 (19)
2.640 (48)
2.336 (17)
1.818 (52)

Type Occurrence of CahniteHide

Geological Setting of Type Material:
Cavities in manganaxinite veinlets traversing Precambrian metamorphosed Zn-Mn-Fe orebody.
Associated Minerals at Type Locality:

Synonyms of CahniteHide

Other Language Names for CahniteHide

German:Cahnit
Japanese:カーン石
Russian:Канит
Simplified Chinese:砷硼钙石
水砷硼钙石
Spanish:Cahnita

Common AssociatesHide

Apophyllite
BorcariteCa4Mg(B4O6(OH)6)(CO3)2
ChabaziteChabazite now is the name of a series of related minerals.
PhillipsiteZeolite Group.
Associated Minerals Based on Photo Data:
Borcarite71 photos of Cahnite associated with Borcarite on mindat.org.
Rhodonite20 photos of Cahnite associated with Rhodonite on mindat.org.
Axinite-(Mn)12 photos of Cahnite associated with Axinite-(Mn) on mindat.org.
Hancockite6 photos of Cahnite associated with Hancockite on mindat.org.
Bementite6 photos of Cahnite associated with Bementite on mindat.org.
Ganophyllite6 photos of Cahnite associated with Ganophyllite on mindat.org.
Marsturite5 photos of Cahnite associated with Marsturite on mindat.org.
Andradite5 photos of Cahnite associated with Andradite on mindat.org.
Hendricksite5 photos of Cahnite associated with Hendricksite on mindat.org.
Jarosewichite4 photos of Cahnite associated with Jarosewichite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3Mon.
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.15Schiavinatoite(Nb,Ta)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.20FroloviteCa[B(OH)4]2Tric.
6.AC.25HexahydroboriteCa[B(OH)4]2 · 6H2OMon. 2/m : B2/b
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4Tric.
6.AC.35BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
6.AC.65SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.2.1LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
10.2.3TeruggiteCa4Mg[AsO4|B6O7(OH)6]2 · 12H2OMon.
10.2.4SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)

Fluorescence of CahniteHide

Fluoresces moderate creamy white in SW UV (Franklin).

Other InformationHide

Notes:
Readily soluble in dilute HCl.
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 CahniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, C. and Bauer, L. (1927) American Mineralogist: 12: 149-153.
Palache, C. (1941) American Mineralogist: 26: 429.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 386-387.
American Mineralogist (1961): 46: 1077-1085.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for CahniteHide

Localities for CahniteHide

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.
Brazil
 
  • Goiás
Orris, G.J., and Grauch, R.I. (2002): USGS Open-File Report 02-189.
Chile
 
  • Antofagasta Region
    • El Loa Province
TESIS PARA OPTAR AL GRADO DE MAGÍSTER EN CIENCIAS, MENCIÓN GEOLOGÍA MEMORIA PARA OPTAR AL TÍTULO DE GEÓLOGO CONSTANZA BEATRIZ NICOLAU DEL ROURE EYLERTS, 2013
China
 
  • Inner Mongolia Autonomous Region
    • Ulanhad League (Chifeng Prefecture)
      • Hexigten Banner (Keshiketeng Co.)
        • Huanggang Fe-Sn deposit (Huanggangliang Mine; Huanggang Mine)
Ottens, B. and G. Neumeier (2012) The Huanggang Mine, Inner Mongolia, China. Mineralogical Record 43:529-563
      • Linxi Co.
        • Linxi
Ottens, B. & Bin, J. (2014): Seltene Boratmineralien aus der Inneren Mongolei, China. Lapis, 39 (7/8), 66-68.
Italy
 
  • Latium
    • Rome Province
Handbook of Mineralogy
      • Rome
        • Valleranello
Stoppani F.S. & Curti E. (1982): I minerali del Lazio, Olimpia, Ed., 266-267.
Japan
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
Shiraga et al (2002), Jourmal of Mineralogical and Petrological Sciences 97,70-73(2002)
Mexico
 
  • Sonora
    • Mun. de Magdalena
Miranda-Gasca, M. A., Gomez-Caballero, J. A., & Eastoe, C. J. (1998). Borate deposits of northern Sonora, Mexico; stratigraphy, tectonics, stable isotopes, and fluid inclusions. Economic Geology, 93(4), 510-523.
Namibia
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
Dunn, P.J. (1991), Rare minerals of the Kombat Mine, Mineralogical Record: 22(6): 421-425; Bezing, L. von., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, (in English)
Norway
 
  • Aust-Agder
    • Arendal
      • Arendal Iron Mines
        • Øyestad
Bugge, J.A.W. (1951); Minerals from the skarn iron ore deposits at Arendal, Norway. I. Cahnite from Klodeborg mine. Det Kongelige Norske Videnskabers Selskab Skrifter, Forhandliger 24:79-81
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Buriatia Republic (Buryatia)
        • Vitim Plateau
Doklady Acad. Nauk SSSR 166,695-697(1966)
Turkey
 
  • Aegean Region
    • Kütahya Province
      • Emet
        • Emet Borate deposit
C.Helvaci & R.N.Alonso (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, 9, 1-27(2000); American Mineralogist; April 1979; v. 64; no. 3-4; p. 362-366; Handbook of Mineralogy ("Espey borate mine")
American Mineralogist; April 1979; v. 64; no. 3-4; p. 362-366
USA (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Palache, C. (1935) American Mineralogist: 26: 126; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 387; Dunn, P.J. (1995): Part5: 660-663.
Mineral and/or Locality  
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