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Formula: Ca2Fe2+[B9O13(OH)6]Cl.4H2O
Hydrated borate with nine crystallographically distinct borate polyhedra, four of
which are triangular BO3 groups and five of which are tetahedral BO4 groups
(CM 34.3.657-665)
Crystal System: Monoclinic
Specific gravity: 2.26 measured, 2.27 calculated
Hardness: 3
Streak: White
Colour: Pale yellow
Luminescence: No fluorescence observed under lomg wave or short wave UV
Environments
Localities
At the type locality, the Potash Corporation of Saskatchewan Mine, Penobsquis, Cardwell Parish, Kings
County, New Brunswick, Canada, borate minerals from two potash mines in the
Penobsquis-Sussex area of New Brunswick were first noted in the early 1980s in residue from the drilling operations. The
list of borate minerals includes boracite, veatchite, colemanite,
danburite, hilgardite-1A,
hilgardite-4M, howlite,
hydroboracite, priceite,
szaibélyite, ulexite,
volkovskite, pringleite,
ruitenbergite, trembathite,
strontioginorite, congolite,
tyretskite, ginorite,
inyoite and penobsquisite. Other minerals found with the
borate assemblage include anhydrite,
sellaite, fluorite,
nickeline, pyrite,
chalcopyrite, sphalerite,
halite, sylvite,
microcline, diopside,
quartz, a mica group mineral, a
clay mineral, hematite,
limonite, magnesite,
calcite, dolomite,
monohydrocalcite and
malachite. Organic material is present in several sections of core.
Penobsquisite was found in only one piece of drill core from the lower third of the Upper Halite member of the
Potash Corporation of Saskatchewan mine, and is intimately associated with halite,
boracite, hilgardite,
pringleite, trembathite,
sellaite, fluorite,
hematite and malachite. Approximately
100 crystals in the size range 0.5 to 1.5 mm were separated
(CM 34.3.657-665).
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