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Wardsmithite

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Formula:
Ca5Mg(B4O7)6 · 30H2O
System:
Hexagonal
Colour:
Colourless, white
Lustre:
Vitreous
Hardness:
Name:
Named after Ward Cromwell Smith (1906-1998), geologist, U.S. Geological Survey who worked with borates.
This page provides mineralogical data about Wardsmithite.


Classification of Wardsmithite

Approved
Approval Year:
1967
6.H0.25

6 : BORATES
H : Unclassified borates
0 :
26.7.7.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
9.3.24

9 : Borates
3 : Borates of Ca and Sr

Physical Properties of Wardsmithite

Vitreous
Colour:
Colourless, white
Hardness (Mohs):
Cleavage:
Distinct/Good
basal
Density:
1.88(2) g/cm3 (Measured)    

Optical Data of Wardsmithite

Type:
Uniaxial (-)
RI values:
nω = 1.490() nε = 1.476(2)
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Wardsmithite

IMA Formula:
Ca5Mg(B4O7)6 · 30H2O
Elements listed in formula:

Crystallography of Wardsmithite

Crystal System:
Hexagonal
Morphology:
anhedral with platy habit
X-Ray Powder Diffraction Data:
d-spacingIntensity
13.5 (100)
12.3 (62)
6.12 (55)
3.358 (51)
4.721 (42)
2.74 (26)

Type Occurrence of Wardsmithite

General Appearance of Type Material:
fine grained nodules
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 136414, 147955, 147956.
Geological Setting of Type Material:
weathered veins of colemanite and priceite
Associated Minerals at Type Locality:

Relationship of Wardsmithite to other Species

6.H0.10Braitschite-(Ce)Ca6.15Na0.85Ce2[B6O7(OH)3(O,OH)3]4 · H2O
6.H0.35HalurgiteMg2[B4O5(OH)4]2 · H2O
6.H0.40EkateriniteCa2B4O7Cl2 · 2H2O
6.H0.45VitimiteCa6B14O19(SO4)(OH)14 · 5H2O
6.H0.50CanavesiteMg2(HBO3)(CO3) · 5H2O
6.H0.55QilianshaniteNaH4(CO3)(BO3) · 2H2O
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
9.3.17MeyerhofferiteCaB3O3(OH)5 · H2O
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
9.3.25HenmiliteCa2Cu[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 Wardsmithite

Name in Other Languages:

Other Information

Other Information:
insoluble in methyl alcohol, is very slightly soluble in cold water, slightly soluble in hot water, and readily soluble in cold dilute 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 Wardsmithite

Reference List:
Erd, R.C., J.F. McAllister & A.C. Vlisidis (1970), Wardsmithite 5CaO•MgO•12B2O3•30H2O, a new borate mineral from the Death Valley region, California: American Mineralogist: 55: 349-357.

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

Internet Links for Wardsmithite

mindat.org URL:
https://www.mindat.org/min-4243.html
Please feel free to link to this page.

Localities for Wardsmithite

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.
(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.
Mexico
 
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.
USA (TL)
 
  • California
    • Inyo Co.
      • Furnace Creek District (Furnace Creek Borate District; Death Valley Area Borate Deposits; Ryan area)
        • Ryan
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; www.mineralsocal.org.
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; McAllister, James Franklin (1970) Geology of the Furnace Creek borate area, Death Valley, Inyo County, California. California Division of Mines and Geology Map Sheet 14, 9 pp.; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 241 & 243.
        • Twenty Mule Team Canyon
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.
    • Kern Co.
      • Kramer District (Kramer Borate District)
        • Boron
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 243.
Mineral and/or Locality  
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