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Cahnite

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About CahniteHide

02183690015357467429443.jpg
Lazard Cahn
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 Springs, Colorado, USA] morphological crystallographer, mineral collector and mineral dealer, who first recognized the material.
Related to Moydite-(Y).


Classification of CahniteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1927
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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000097CahnitePrewitt C T, Buerger M J (1961) The crystal structure of cahnite, Ca2BAsO4(OH)4 American Mineralogist 46 1077-10851961Franklin, New Jersey, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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

Geological EnvironmentHide

Geological Setting:
cavities in boron-bearing and arsenate-bearing vugs in basalt, boron-bearing and arsenate-bearing hydrothermal veins

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:
Reference:
Palache, C., Bauer, L.H. (1927) Cahnite, a new boro-arsenate of calcium from Franklin, New Jersey. American Mineralogist: 12: 149-153.

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
ChabaziteAccording to the current nomenclature for zeolite minerals (Coombs et al.
Phillipsite subgroupZeolite Group.
Associated Minerals Based on Photo Data:
71 photos of Cahnite associated with BorcariteCa4Mg(B4O6(OH)6)(CO3)2
20 photos of Cahnite associated with RhodoniteCaMn3Mn[Si5O15]
12 photos of Cahnite associated with Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
6 photos of Cahnite associated with Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
6 photos of Cahnite associated with BementiteMn7Si6O15(OH)8
6 photos of Cahnite associated with Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
5 photos of Cahnite associated with MarsturiteNaCaMn3Si5O14(OH)
5 photos of Cahnite associated with AndraditeCa3Fe3+2(SiO4)3
5 photos of Cahnite associated with HendricksiteKZn3(Si3Al)O10(OH)2
4 photos of Cahnite associated with JarosewichiteMn2+3Mn3+(AsO4)(OH)6

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 · 2H2O or CaB2O4 · 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]2[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., Bauer, L.H. (1927) Cahnite, a new boro-arsenate of calcium from Franklin, New Jersey. 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.
Embrey, P.G. (1960) Cahnite from Capo di Bove, Rome. Mineralogical Magazine: 32: 666-668.
Prewitt, C.T., Buerger, M.J. (1961) Crystal structure of cahnite. American Mineralogist: 46: 1077-1085.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Shiraga, K., Kusachi, I., Kobayashi, S., Takechi, Y. (2002) Cahnite from Fuka, Okayama Prefecture, Japan. Journal of Mineralogical and Petrological Sciences: 97: 70-73.
Thompson, R.M., Yang, H., Downs, R.T. (2012) Packing systematics and structural relationships of the new copper molybdate markascherite and related minerals. American Mineralogist: 97: 1977-1986.

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
    • 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
    • Chifeng City (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 County
        • Linxi
Ottens, B. & Bin, J. (2014): Seltene Boratmineralien aus der Inneren Mongolei, China. Lapis, 39 (7/8), 66-68.
Italy
 
  • Lazio
    • Metropolitan City of Rome Capital
      • Rome
Embrey, P.G. (1960) Cahnite from Capo di Bove, Rome. Mineralogical Magazine, 32, 666-668.
        • Valleranello
Stoppani, F.S., and Curti, E. (1982) I minerali del Lazio. Editoriale Olimpia, Firenze, 291 pp.; Liotti, L. (1995) I minerali del complesso vulcanico dei Colli Albani. Seconda parte. Rivista Mineralogica Italiana, 18, 1 (1-1995), 55-70; Carlini, R., and Signoretti, E. (2018) Il Lazio classico: le cave di leucitite della provincia di Roma (Vallerano, Laghetto e Osa). Fossils & Minerals, 4, 24-53.
Japan
 
  • 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
    • Magdalena Municipality
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
      • 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
 
  • Agder
    • Arendal
      • 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
 
  • Zabaykalsky Krai
    • Buriatia Republic (Buryatia)
      • Vitim Plateau
Doklady Acad. Nauk SSSR 166,695-697(1966)
Turkey
 
  • Kütahya Province
    • Emet District
      • 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 County
      • 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.
 
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