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J.F McAllister
Mg2[B6O7(OH)6]2 · 9H2O
colourless, white
Specific Gravity:
Crystal System:
Named in 1965 by Waldemar Schaller, Angellina Calomeris Vlisidis, and Mary Emma Mrose in honor of James Franklin McAllister [November 11, 1911- September 29, 2000 Menlo Park, California, USA] USGS Geologist who first described the material.
This page provides mineralogical data about Mcallisterite.

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Classification of McallisteriteHide

Approval Year:

F : Hexaborates
A : Neso-hexaborates

6 : Hexaborates

9 : Borates
2 : Borates of Be and Mg

Physical Properties of McallisteriteHide

colourless, white
2½ on Mohs scale
on {0001} and {0112}
1.867(5) g/cm3 (Measured)    1.866 g/cm3 (Calculated)

Optical Data of McallisteriteHide

Uniaxial (-)
RI values:
nω = 1.504 nε = 1.459
Max Birefringence:
δ = 0.045
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of McallisteriteHide

Mg2[B6O7(OH)6]2 · 9H2O

Crystallography of McallisteriteHide

Crystal System:
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
Cell Parameters:
a = 11.546(1) Å, c = 35.562(5) Å
a:c = 1 : 3.08
Unit Cell V:
4,105.63 ų (Calculated from Unit Cell)
Rhombohedral crystals to 12 mm, efforescences

Type Occurrence of McallisteriteHide

Synonyms of McallisteriteHide

Other Language Names for McallisteriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Gowerite1 photo of Mcallisterite associated with Gowerite on
Starkeyite1 photo of Mcallisterite associated with Starkeyite on

Related Minerals - Nickel-Strunz GroupingHide

6.FA.05AksaiteMg[B6O7(OH)6] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
6.FA.15AdmontiteMgB6O10 · 7H2OMon.
6.FA.20RivadaviteNa6Mg[B6O7(OH)6]4 · 10H2OMon. 2/m : P21/m
6.FA.25TeruggiteCa4Mg[AsO4|B6O7(OH)6]2 · 12H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.2.1HambergiteBe2(BO3)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.2.3KotoiteMg3[BO3]2Orth. mmm (2/m 2/m 2/m) : Pnnm
9.2.6AksaiteMg[B6O7(OH)6] · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
9.2.7WightmaniteMg5(BO3)O(OH)5 · 2H2OMon.
9.2.8PinnoiteMg[B2O(OH)6]Tet. 4/m : P42/m
9.2.9KurnakoviteMgB3O3(OH)5 · 5H2OTric. 1 : P1
9.2.10HalurgiteMg2[B4O7]2 · 5H2OMon.
9.2.11InderiteMgB3O3(OH)5 · 5H2OMon. 2/m : P21/b
9.2.12HungchaoiteMg(B4O7) · 9H2OTric. 1
9.2.13AdmontiteMgB6O10 · 7H2OMon.
9.2.15RivadaviteNa6Mg[B6O7(OH)6]4 · 10H2OMon. 2/m : P21/m
9.2.16KaliboriteKMg2H[B6O8(OH)5]2(H2O)4Mon. 2/m : B2/b
9.2.17IquiqueiteK3Na4Mg(CrO4)B24O39(OH) · 12H2OHex.

Fluorescence of McallisteriteHide

Pale yellow

Other InformationHide

Slowly soluble in water.
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 McallisteriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schaller, Waldemar Theodore, Angelina Calomeris Vlisidis & Mary Emma Mrose (1964), Macallisterite, 2MgO.6B2O36.15H2O, a new hydrous magnesium borate mineral from the Death Valley region, Inyo County, California (abstract): Geol. Soc. Amer. Program, Miami, Florida Meeting: 173, Nov, 1964.
American Mineralogist (1965): 50: 629-640.
American Mineralogist (1967): 52: 1776.
Dal Negro, A. (1969), The crystal structure of mcallisterite, Mg2[B6O7(OH)6]2•9H20 (abstract): Mineralogical Abstracts (1972): 23: 172.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for McallisteriteHide

Localities for McallisteriteHide

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.
  • Salta
    • Los Andes department
      • Salar del Hombre Muerto
Amer. Mineral., 1967, 52, 326.; Am Min 58:308-313; Alonso, R. N. (1999). On the origin of La Puna borates. Acta geológica hispánica, 34(2), 141-166.; 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.
  • Qinghai Province
    • Haixi Autonomous Prefecture
      • Da Qaidam Co. (Dachaidan Co.)
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10; Garrett, D.E. (1998): Borates: Handbook of deposits, processing, properties, and use. Academic Press (San Diego, London), 491 pp.; Qingzhong Wang, Yingkai Xiao, Chonggeng Zhang, Haizhen Wei, and Zhiqi Zhao (2001): Bulletin of Mineralogy, Petrology and Geochemistry 20(4), 344-366; Zheng, M. P., Qi, W., & Yuan, H. R. (2005). Characteristics of salt lake boron deposits and magnesium borate deposits of the Qinghai-Tibet Plateau, China. In Mineral Deposit Research: Meeting the Global Challenge (pp. 1123-1125). Springer Berlin Heidelberg.
  • Atyrau Province (Atyrau Oblysy; Atyrau Oblast')
    • Atyrau (Gur'yev)
Anatoly Kasatkin data
  • California
    • Inyo Co.
      • Death Valley
Econ Geol (1996) 91:622-635
      • Furnace Creek District (Furnace Creek Borate District; Death Valley Area Borate Deposits; Ryan area)
        • Ryan
Am Min 64:3-4 pp 369-375; American Mineralogist: 55: 349-357; Erd, R.C., J.F. McAllister, and G.D. Eberlein (1979) New data on hungchaoite, the second world occurrence, Death Valley region, California. American Mineralogist: 64: 369-375.
        • Twenty Mule Team Canyon
American Mineralogist (1979): 64(3-4): 369-375.; Erd, R.C., J.F. McAllister, and G.D. Eberlein (1979) New data on hungchaoite, the second world occurrence, Death Valley region, California. American Mineralogist: 64: 369-375.
Schaller, Waldemar Theodore, et al (1965), American Mineralogist: 65: 629-640; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 240.
Am Min 64:3-4 pp 369-375; Erd, R.C., J.F. McAllister, and G.D. Eberlein (1979) New data on hungchaoite, the second world occurrence, Death Valley region, California. American Mineralogist: 64: 369-375.
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
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