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Meyerhofferite

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Formula:
CaB3O3(OH)5 · H2O
System:
Triclinic
Colour:
Colourless, white
Lustre:
Vitreous, Silky
Hardness:
2
Member of:
Name:
For German chemist, Wilhelm Meyerhoffer (1864-1906), collaborator with J.H. van't Hoff on the composition and origin of saline minerals, and who synthesized the compound.
Inderite Group.
Occurs principally as an alteration product of Inyoite.


Classification of Meyerhofferite

Approved, 'Grandfathered' (first described prior to 1959)
6.CA.30

6 : BORATES
C : Triborates
A : Neso-triborates
26.3.2.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates
9.3.17

9 : Borates
3 : Borates of Ca and Sr

Physical Properties of Meyerhofferite

Vitreous, Silky
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless, white
Hardness (Mohs):
2
Cleavage:
Perfect
On {010} perfect; {100} and {110} in traces.
Density:
2.12 g/cm3 (Measured)    2.116 g/cm3 (Calculated)

Optical Data of Meyerhofferite

Type:
Biaxial (-)
RI values:
nα = 1.500 nβ = 1.535 nγ = 1.560
2V:
Measured: 78° , Calculated: 78°
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
relatively weak

Chemical Properties of Meyerhofferite

IMA Formula:
CaB3O3(OH)5 · H2O
Elements listed in formula:

Crystallography of Meyerhofferite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.6Å, b = 8.33Å, c = 6.48Å
α = 91°, β = 101.31°, γ = 86.55°
Ratio:
a:b:c = 0.792 : 1 : 0.778
Unit Cell Volume:
V 348.70 ų (Calculated from Unit Cell)
Morphology:
Crystals elongated [001] and usually flattened (100). Fibrous. As pseudomorphs after Inyoite.

Crystallographic forms of Meyerhofferite

Crystal Atlas:
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Meyerhofferite no.1 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Opaque | Translucent | Transparent

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Type Occurrence of Meyerhofferite

Relationship of Meyerhofferite to other Species

Member of:
Other Members of Group:
InderboriteCaMg(H3B3O7)2 · 8H2O
InderiteMgB3O3(OH)5 · 5H2O
InyoiteCa(H4B3O7)(OH) · 4H2O
KurnakoviteMgB3O3(OH)5 · 5H2O
SolongoiteCa2(H3B3O7)(OH)Cl
6.CA.10AmeghiniteNaB3O3(OH)4
6.CA.15InderiteMgB3O3(OH)5 · 5H2O
6.CA.20KurnakoviteMgB3O3(OH)5 · 5H2O
6.CA.25InderboriteCaMg[B3O3(OH)5]2 · 6H2O
6.CA.35InyoiteCaB3O3(OH)5 · 4H2O
6.CA.40SolongoiteCa2B3O4(OH)4Cl
6.CA.45Peprossiite-(Ce)(Ce,La)(Al3O)2/3B4O10
6.CA.50NifontoviteCa3[BO(OH)2]6 · 2H2O
6.CA.55OlshanskyiteCa2[B3O3(OH)6]OH · 3H2O
9.3.1CalciboriteCaB2O4
9.3.2SibirskiteCaHBO3
9.3.3FabianiteCaB3O5(OH)
9.3.4UralboriteCaB2O2(OH)4
9.3.5VimsiteCaB2O2(OH)4
9.3.6OlshanskyiteCa2[B3O3(OH)6]OH · 3H2O
9.3.7FroloviteCa[B(OH)4]2
9.3.8KorzhinskiteCaB2O4 · 0.5H2O
9.3.9TyretskiteCa2B5O9(OH) · H2O
9.3.10NifontoviteCa3[BO(OH)2]6 · 2H2O
9.3.12InyoiteCaB3O3(OH)5 · 4H2O
9.3.13GoweriteCa[B5O8(OH)][B(OH)3] · 3H2O
9.3.14ColemaniteCaB3O4(OH)3 · H2O
9.3.15PentahydroboriteCaB2O(OH)6 · 2H2O
9.3.16HexahydroboriteCa[B(OH)4]2 · 2H2O
9.3.18PriceiteCa2B5O7(OH)5 · H2O
9.3.19GinoriteCa2B14O20(OH)6 · 5H2O
9.3.20ProbertiteNaCaB5O7(OH)4 · 3H2O
9.3.21UlexiteNaCaB5O6(OH)6 · 5H2O
9.3.22HydroboraciteCaMg[B3O4(OH)3]2 · 3H2O
9.3.23InderboriteCaMg[B3O3(OH)5]2 · 6H2O
9.3.24WardsmithiteCa5Mg(B4O7)6 · 30H2O
9.3.25HenmiliteCa2Cu[B(OH)4]2(OH)4
9.3.26StrontioboriteSrB8O11(OH)4
9.3.27VeatchiteSr2[B5O8(OH)]2B(OH)3 · H2O
9.3.28Veatchite-ASr2B11O16(OH)5 · H2O
9.3.29 P-VeatchiteSr2B11O16(OH)5 · H2O
9.3.30 BalavinskiteSr2B6O11 · 4H2O
9.3.31TunelliteSrB6O9(OH)2 · 3H2O
9.3.32StrontioginoriteSrCaB14O20(OH)6 · 5H2O

Other Names for Meyerhofferite

Name in Other Languages:

Other Information

Other Information:
Readily soluble in acids.
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 Meyerhofferite

Reference List:
Schaller, W.T. (1914) Journal of the Washington Academy of Science: 4: 355.

Schaller, W.T. (1916), Inyoite and meyerhofferite, two new calcium borates, USGS Bull. 610: 35-55.

Palache, Charles (1938), Crystallography of meyerhofferite: American Mineralogist: 23: 644-648.

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: 356-358.

Christ, C.L. & J.R. Clark (1956), The structure of meyerhofferite 2CaO • 3B2O•7H2O, aP1 crystal, determined by the direct method of Hauptman and Karle: Acta Crystallographica: 9: 830.

Zeitschrift für Kristallographie (1960): 114: 321, 343-354.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Meyerhofferite

mindat.org URL:
https://www.mindat.org/min-2699.html
Please feel free to link to this page.
Specimens:
The following Meyerhofferite specimens are currently listed for sale on minfind.com.

Localities for Meyerhofferite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Argentina
 
  • Salta
    • Los Andes department
      • Sijes
Jewel Tunnel Import specimens.
Colorado School of Mines Geology Museum specimen
Galliski, M.A., Cooper, M.A., Márquez-Zavalía, M.F., and Hawthorne, F.C. (2010) Alfredstelznerite: a new calcium borate hydrate from Santa Rosa mine, Salta, northwestern Argentina. Canadian Mineralogist, 48, 123-128; CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, 9:1-27.
Mexico
 
  • Sonora
    • Mun. de Magdalena
      • Aguja
Garrett, D.E. (1998): Borates - Handbook of Deposits, Processing, Properties and Use. Academic Press (San Diego, London), 475 pp.; 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.
Turkey
 
  • Aegean Region
    • Aydin Province
    • Kütahya Province
      • Emet
        • Emet Borate deposit
CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, Vol. 9, 2000, pp. 1-27; American Mineralogist; April 1979; v. 64; no. 3-4; p. 362-366
J.W. Anthony, R.A. Bideaux, K.W. Bladh, M.C. Nichols: Handbook of Mineralogy, Vol. V (2003)
  • Central Anatolia Region
    • Eskişehir Province
      • Kirka
CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, Vol. 9, 2000, pp. 1-27; http://www.mineralienatlas.de/lexikon/index.php/T%FCrkei/Eskisehir/Kirka/Sarikaya; Baysal, O. (1972) : A mineralogical study and genesis of Sarıkaya (Kırka) borate deposits. Hacettepe University, Ankara.
  • Marmara Region
    • Balikesir Province
      • Bigadiç
CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, Vol. 9, 2000, pp. 1-27
        • Çamköy
Meixner, H. (1953): Contributions to Mineralogy and Petrology 3(6), 445-455.
        • Faraşköy (Faraş)
Erik Vercammen collection
        • Iskeleköy (Iskele)
Meixner, H. (1953): Contributions to Mineralogy and Petrology 3(6), 445-455.
USA (TL)
 
  • California
    • Inyo Co.
      • Amargosa Range
        • Black Mts
          • Monte Blanco
Journal of the Washington Academy of Science (1914): 4: 354-356; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, 7th. ed., Volume II: 357, 359; Schaller, Waldemar Theodore (1916b), Inyoite and meyerhofferite, two new calcium borates: USGS Bulletin 610: 35; Foshag, William Frederick (1921), The origin of the colemanite deposits of California: Economic Geology: 16: 200; Foshag, William Frederick (1924a), Famous mineral localities: Furnace Creek, Death Valley, California: American Mineralogist: 9: 10; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 264.
          • Zabriskie Point
www.mineralsocal.org
      • Furnace Creek District (Furnace Creek Borate District; Death Valley Area Borate Deposits; Ryan area)
        • Ryan
Schaller, Waldemar Theodore (1916b), Inyoite and meyerhofferite, two new calcium borates: USGS Bulletin 610: 35; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 228.
Am Min (1959) 44:911-919
Erd, R.C., J.F. McAllister, and A.C. Vlisidis (1970) Wardsmithite 5CaO • MgO •12B2O3 •30H2O, a new borate mineral from the Death Valley region, California. American Mineralogist: 55: 349-357.
        • Twenty Mule Team Canyon
Erd, R.C., J.F. McAllister & H. Almond (1959), Gowerite, a new hydrous calcium borate from Death Valley, California: American Mineralogist: 44: 911-919.
    • Kern Co.
      • Kramer District (Kramer Borate District)
www.mineralsocal.org
Cal Div of Mines & Geology "Mineral Information Service" V. 22 N. 10 Oct 1969
            • U.S. Borax Mine (Pacific West Coast Borax; Pacific Coast Borax Co.; Boron Mine; Boron open pit; U.S. Borax and Chemical Corporation Mine; Kramer Mine; Kramer pit; Baker Mine)
Pemberton, H. Earl, Wm. Moller, Jack Schwartz & George Masimer (1960), The minerals of Boron, California, 40 pp. (Published by the Mineral Research Soc. of California, Montebello, CA): 27; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 265; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 246.
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