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Ca3[B5O6(OH)6](OH)Cl2 · 8H2O
Crystal System:
For Brian V. Roulston (1948-), geologist and evaporites specialist, in recognition of his work on the geology of evaporite deposits.
This page provides mineralogical data about Brianroulstonite.

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Classification of BrianroulstoniteHide


E : Pentaborates
C : Phyllo-pentaborates

Physical Properties of BrianroulstoniteHide


Optical Data of BrianroulstoniteHide

Biaxial (-)
RI values:
nα = 1.506 nβ = 1.527 nγ = 1.532
Measured: 56° , Calculated: 50°
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of BrianroulstoniteHide

Ca3[B5O6(OH)6](OH)Cl2 · 8H2O
IMA Formula:
Ca3B5O6(OH)7Cl2 · 8H2O

Crystallography of BrianroulstoniteHide

Crystal System:

Type Occurrence of BrianroulstoniteHide

Synonyms of BrianroulstoniteHide

Other Language Names for BrianroulstoniteHide

Related Minerals - Nickel-Strunz GroupingHide

6.EC.05BiringucciteNa2B5O8(OH) · H2OMon.
6.EC.05NasiniteNa2[B5O8(OH)] · 2H2OOrth.
6.EC.10GoweriteCa[B5O8(OH)][B(OH)3] · 3H2OMon.
6.EC.15P-VeatchiteSr2B11O16(OH)5 · H2O
6.EC.15VeatchiteSr2B11O16(OH)5 · H2OMon. m : Bb
6.EC.20VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2OTric. 1 : P1
6.EC.25TuzlaiteNaCaB5O8(OH)2 · 3H2OMon. 2/m : P21/b

Other InformationHide

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 BrianroulstoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grice, J.D., Gault, R.A., and Van Velthuizen, J. (1997) Brianroulstonite: a new borate mineral with a sheet structure. Canadian Mineralogist: 35: 751-758.
Jambor, J.L. and Roberts, A.C. (1998) New mineral names. American Mineralogist: 83: 400-403.
Grice, J.D., Gault, R.A., and Van Velthuizen, J. (2005) Borate minerals from the Penobsquis and Millstream deposits, Southern New Brunswick, Canada. Canadian Mineralogist: 43: 1469-1487.

Internet Links for BrianroulstoniteHide

Localities for BrianroulstoniteHide

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.
Canada (TL)
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
        • Penobsquis
Grice, J.D., Gault, R.A., and Van Velthuizen, J. (1997) Brianroulstonite: a new borate mineral with a sheet structure. Canadian Mineralogist: 35: 751-758.; Jambor, J.L. and Roberts, A.C. (1998) New mineral names. American Mineralogist: 83: 400-403.; Mineralogical Record (1998) 29: 234.
      • Hammond Parish
        • Salt Springs evaporite deposit
BURNS, P.C., HAWTHORNE, F.C. & STIRLING, J.A.R. (1992): Trembathite, (Mg,Fe)3B7O13Cl, a new borate mineral from the Salt Springs potash deposit, Sussex, New Brunswick. Canadian Mineralogist 30, 445-448.
  • Central Anatolia Region
    • Eskişehir Province
      • Kirka
Koçak, İ. & Koç, Ş. (2016): Geochemical characteristics of Kırka (Sarıkaya) borate deposit, northwestern Anatolia, Turkey. Journal of Earth System Science: 125: 147-164; (2016)
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