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Brianroulstonite

Formula:
Ca
 
3
[B
 
5
O
 
6
(OH)
 
6
](OH)Cl
 
2
·8H
 
2
O
System:MonoclinicLustre:Vitreous
Hardness:5
Name:For Brian V. Roulston (1948-), in recognition of his work on the geology of evaporite deposits.
This page provides mineralogical data about Brianroulstonite.

Classification of Brianroulstonite

IMA status:Approved
Strunz 8th edition ID:5/K.09-05
Nickel-Strunz 10th (pending) edition ID:6.EC.35

6 : BORATES
E : Pentaborates
C : Phyllo-pentaborates
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Type Occurrence of Brianroulstonite

Type Locality:Potash Corporation of Saskatchewan Mine (PCS Mine; Potash Corporation of America Mine), Penobsquis, Cardwell Parish, Sussex, Kings Co., New Brunswick, Canada

Physical Properties of Brianroulstonite

Lustre:Vitreous
Hardness (Mohs):5

Crystallography of Brianroulstonite

Crystal System:Monoclinic

Optical Data of Brianroulstonite

Type:Biaxial (-)
RI values: nα = 1.506 nβ = 1.527 nγ = 1.532
2V:Measured: 56° , Calculated: 50°
Maximum Birefringence:δ = 0.026

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:none

Chemical Properties of Brianroulstonite

Formula:
Ca
 
3
[B
 
5
O
 
6
(OH)
 
6
](OH)Cl
 
2
·8H
 
2
O
Essential elements:B, Ca, Cl, H, O
All elements listed in formula:B, Ca, Cl, H, O

Relationship of Brianroulstonite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.EC.05Biringuccite
Na
 
2
B
 
5
O
 
8
(OH)·H
 
2
O
6.EC.05Nasinite
Na
 
4
B
 
10
O
 
17
·5H
 
2
O
6.EC.10Gowerite
Ca[B
 
5
O
 
8
(OH)][B(OH)
 
3
]·3H
 
2
O
6.EC.15P-Veatchite
6.EC.15Veatchite
Sr
 
2
B
 
11
O
 
16
(OH)
 
5
·H
 
2
O
6.EC.20Volkovskite
KCa
 
4
[B
 
5
O
 
8
OH]
 
4
[B(OH)
 
3
]
 
2
Cl·4H
 
2
O
6.EC.25Tuzlaite
NaCaB
 
5
O
 
8
(OH)
 
2
·3H
 
2
O
6.EC.30Heidornite
Na
 
2
Ca
 
3
B
 
5
O
 
8
(SO
 
4
)
 
2
Cl(OH)
 
2

Other Names for Brianroulstonite

Synonyms:
IMA1996-009
Other Languages:
German:Brianroulstonit
Spanish:Brianroulstonita

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 Brianroulstonite

Reference List:Mineralogical Record: 29: 234.

Grice, J.D., Galt, R.A., and Van Velthuizen, J. (1997) Brianrulstonite: a new borate mineral with a sheet structure. Canadian Mineralogist: 35: 751-758.

American Mineralogist (1998): 83: 400.

Internet Links for Brianroulstonite

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    Localities for Brianroulstonite

    (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.
    Canada
     
    • New Brunswick
      • Kings Co.
        • Sussex
          • Cardwell Parish
            • Penobsquis
    		Canadian Mineralogist (1997): 35: 751; Mineralogical Record (1998): 29: 234.
    Mineral and/or Locality
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