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Mcallisterite

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Furnace Creek District, Death Valley, Inyo Co., California, USA
© Knut Eldjarn

Show Mcallisterite Photos (3)
Formula:
Mg
 
2
[B
 
6
O
 
7
(OH)
 
6
]
 
2
 · 9H
 
2
O
System:TrigonalColour:colourless, white
Hardness:2½
This page provides mineralogical data about Mcallisterite.

Classification of Mcallisterite

IMA status:Approved 1963
Strunz 8th edition ID:5/H.17-20
Nickel-Strunz 10th (pending) edition ID:6.FA.10

6 : BORATES
F : Hexaborates
A : Neso-hexaborates
Dana 8th edition ID:26.6.2.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
Hey's CIM Ref.:9.2.14

9 : Borates
2 : Borates of Be and Mg
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Type Occurrence of Mcallisterite

Type Locality:Mott colemanite prospect, 20 Mule Team Canyon, Death Valley, Inyo Co., California, USA
Year of Discovery:1965

Physical Properties of Mcallisterite

Colour:colourless, white
Streak:white
Hardness (Mohs):2½
Cleavage:Distinct/Good

Crystallography of Mcallisterite

Crystal System:Trigonal

Optical Data of Mcallisterite

Type:Uniaxial (-)
RI values: nω = 1.504 nε = 1.459
Maximum Birefringence:δ = 0.045

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Mcallisterite

Formula:
Mg
 
2
[B
 
6
O
 
7
(OH)
 
6
]
 
2
 · 9H
 
2
O
Essential elements:B, H, Mg, O
All elements listed in formula:B, H, Mg, O

Relationship of Mcallisterite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.FA.05Aksaite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 2H
 
2
O
6.FA.15Admontite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 4H
 
2
O
6.FA.20Rivadavite
Na
 
6
Mg[B
 
6
O
 
7
(OH)
 
6
]
 
4
 · 10H
 
2
O
6.FA.25Teruggite
Ca
 
4
Mg[AsO
 
4
|B
 
6
O
 
7
(OH)
 
6
]
 
2
 · 12H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
9.2.1Hambergite
Be
 
2
[O|OH|BO
 
2
]
9.2.2Suanite
Mg
 
2
[B
 
2
O
 
5
]
9.2.3Kotoite
Mg
 
3
[BO
 
3
]
 
2
9.2.4Szaibélyite
Mg
 
2
[B
 
2
O
 
5
] · H
 
2
O
9.2.5Preobrazhenskite
Mg
 
3
B
 
11
O
 
15
(OH)
 
9
9.2.6Aksaite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 2H
 
2
O
9.2.7Wightmanite
Mg
 
5
[O|(OH)
 
5
|BO
 
3
] · 2H
 
2
O
9.2.8Pinnoite
Mg[B
 
2
O
 
5
] · 3H
 
2
O
9.2.9Kurnakovite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
9.2.10Halurgite
Mg
 
2
[B
 
4
O
 
7
]
 
2
 · 5H
 
2
O
9.2.11Inderite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
9.2.12Hungchaoite
Mg[B
 
4
O
 
7
] · 9H
 
2
O
9.2.13Admontite
Mg[B
 
6
O
 
7
(OH)
 
6
] · 4H
 
2
O
9.2.15Rivadavite
Na
 
6
Mg[B
 
6
O
 
7
(OH)
 
6
]
 
4
 · 10H
 
2
O
9.2.16Kaliborite
KMg
 
2
H[B
 
6
O
 
8
(OH)
 
5
]
 
2
(H
 
2
O)
 
4
9.2.17Iquiqueite
K
 
3
Na
 
4
Mg(CrO
 
4
)B
 
24
O
 
39
(OH)·12H
 
2
O

Other Names for Mcallisterite

Synonyms:
IMA1963-012
Other Languages:
German:Mcallisterit
Russian:Макэлистерит
Spanish:Mcallisterita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mcallisterite

Reference List: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).

Articles/Blogs about Mcallisterite

Internet Links for Mcallisterite

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    Localities for Mcallisterite

    Hide Locality List
    The 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.
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    (TL) indicates type locality. ? 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
      • Salar Del Hombre Muerto
    		Amer. Mineral., 1967, 52, 326.
    USA
     
    • California
      • Inyo Co.
        • Death Valley
          • 20 Mule Team Canyon
    		AmMin (1965) 50:629-640.
          • Furnace Creek District
            • Black Mts
    		Am Min 64:3-4 pp 369-375
    American Mineralogist (1979): 64(3-4): 369-375.
    Am Min 64:3-4 pp 369-375
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Ogdensburg
            • Sterling Hill
    		Dunn(1995):Pt5:641.
    Mineral and/or Locality
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