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Penobsquisite

Formula:
Ca
 
2
Fe
2+
 
[Cl|B
 
9
O
 
13
(OH)
 
6
]Cl · 4H
 
2
O
System:MonoclinicColour:Pale yellow
Lustre:VitreousHardness:3
This page provides mineralogical data about Penobsquisite.

Classification of Penobsquisite

IMA status:Approved
Strunz 8th edition ID:5/K.09-30
Nickel-Strunz 10th (pending) edition ID:6.GB.10

6 : BORATES
G : Heptaborates and other megaborates
B : Phyllo-nonborates, etc.
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Type Occurrence of Penobsquisite

Co-type Localities:Potash Corporation of America Mine, Penobsquis, Cardwell Parish, Sussex, Kings Co., New Brunswick, Canada
Potash Corporation of Saskatchewan Mine (PCS Mine), Penobsquis, Cardwell Parish, Sussex, Kings Co., New Brunswick, Canada

Physical Properties of Penobsquisite

Lustre:Vitreous
Colour:Pale yellow
Hardness (Mohs):3

Crystallography of Penobsquisite

Crystal System:Monoclinic

Optical Data of Penobsquisite

Type:Biaxial (+/-)
RI values: nα = 1.550 nβ = 1.554 nγ = 1.592
Maximum Birefringence:δ = 0.042

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:r < v strong

Chemical Properties of Penobsquisite

Formula:
Ca
 
2
Fe
2+
 
[Cl|B
 
9
O
 
13
(OH)
 
6
]Cl · 4H
 
2
O
Essential elements:B, Ca, Cl, Fe, H, O
All elements listed in formula:B, Ca, Cl, Fe, H, O

Relationship of Penobsquisite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.GB.05Studenitsite
NaCa
 
2
[B
 
9
O
 
14
(OH)
 
4
]·2H
 
2
O
6.GB.15Preobrazhenskite
Mg
 
3
B
 
11
O
 
15
(OH)
 
9
6.GB.20Walkerite
Ca
 
16
(Mg,Li,[])
 
2
[B
 
13
O
 
17
(OH)
 
12
]
 
4
Cl
 
6
·28H
 
2
O

Other Names for Penobsquisite

Synonyms:
IMA1995-014
Other Languages:
German:Penobsquisit
Russian:Пенобсквисит
Spanish:Penobsquisita

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 Penobsquisite

Reference List:Mineralogical Record: 28: 143-144.

Grice, J.D., Gault, R.A., and Van Velthuizen, J. (1996) Penobsquisite: a new borate mineral with a complex framework structure. Canadian Mineralogist (1996): 34: 657-665.

American Mineralogist (1997): 82: 208.

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

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    Localities for Penobsquisite

    (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 (1996): 34: 657-665.
    Mineral and/or Locality
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