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Mixed Minerals

Sunday, 21 February 2021 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including gillardite, grossular, ixiolite, krauskopfite, macdonaldite, and maskelynite and more from places like Carr Boyd Nickel Deposit, Western Austrialia, Australia, Sierra de Cruces, Coahuila, Mexico, Helen Beryl mine, Custer Co., South Dakota, United States, Esquire #1 claim, Fresno Co., California, United States, Big Creek, Fresno Co., California, United States, and Manicouagan Crater, Mont de Bablel, Quebec, Canada.

SOLD

Gillardite

#55198

Details
Data
Provenance
Resources

Locality: Carr Boyd Nickel Deposit, Western Austrialia, Australia
Formula: Cu²⁺₃NiCl₂(OH)₆
Availability: Sold
Size: 6 x 5 x 4 cm - Sm Cabinet
Tagged: copper , nickel
Special Info: Raman

Raman verified Gillardite. The crystals are emerald to dak green rhombic-looking crystals to 0.75mm across face. Very good coverage. It's a good specimen, don't pass it up.

Gillardite

Formula: Cu²⁺₃NiCl₂(OH)₆
Crystal System: Trigonal
Crystal Habit: Triangular Crystals, Aggregates
Cleavage: Good, None, None
Luster: Vitreous (Glassy)
Color: dark green
Streak: green
Class: Trigonal - Rhombohedral
Fracture: Splintery
Hardness: 3

Special Info: Raman

Mineralpedia: View Gillardite
On Dakota Matrix: Previously Sold Gillardite
On Dakota Matrix: Other Available Gillardite
WebMineral: View Gillardite
Mindat: View Gillardite

SOLD

Grossular

garnet - #55195

Details
Data
Provenance
Resources

Locality: Sierra de Cruces, Coahuila, Mexico
Formula: Ca₃Al₂(SiO₄)₃
Availability: Sold
Size: 4.5 x 4.5 x 4 cm - Miniature

A beautiful nicely formed Grossular crystal to 1.5cm with several much smaller crystals in rhyolite matrix. A great specimen, well-trimmed, suitable for a cotten-lined box or an eye-catching display piece.

Grossular

On Dakota Matrix: Previously Sold Grossular
On Dakota Matrix: Other Available Grossular
WebMineral: View Grossular
Mindat: View Grossular

SOLD

Ixiolite

#55159

Details
Data
Provenance
Resources

Locality: Helen Beryl mine, Custer Co., South Dakota, United States
Formula: (Ta,Nb,Sn,Fe,Mn)O₂
Availability: Sold
Size: 6 x 5 x 2.5 cm - Sm Cabinet
Tagged: tin
Special Info: EDS Confirmed

(EDS) It looks like Columbite but contains enough manganese, iron, and tin to be called Ixiolite, which is rare in the Black Hills. This is so far the only locality in the Black Hills. Streak alone is not enough to distingish it from Columbite but can eliminate Cassiterite, which is usually colorless to very hard brownish red. This specimen streaks a hard black. Of course nothing is concrete with any of these black oxides in pegmatites so EDS is pretty much required.

Ixiolite

Formula: (Ta,Mn,Nb)O₂
Crystal System: Monoclinic
Crystal Habit: Prismatic, Irregular Grains
Cleavage: Indistinct, None, None
Luster: Metallic
Color: gray, black, steel gray
Streak: dark brown
Class: Monoclinic - Prismatic
Fracture: Conchoidal - Uneven
Hardness: 6-6.5

Special Info: EDS Confirmed

On Dakota Matrix: Previously Sold Ixiolite
On Dakota Matrix: Other Available Ixiolite
WebMineral: View Ixiolite
Mindat: View Ixiolite

SOLD

Krauskopfite

#42759

Details
Data
Provenance
Resources

Locality: Esquire #1 claim, Fresno Co., California, United States
Formula: BaSi₂O₅·3H₂O
Availability: Sold
Size: 3.5 x 2 x 2 cm - Miniature
Special Info: Type Locality

Extremely rare barium silicate occuring as an alteration product of Sanbornite. The Krauskopfite can be seen as colorless, very reflective, cleavages to 4mm on the face of the specimen.

Krauskopfite

Formula: BaSi₂O₅·3H₂O
Crystal System: Monoclinic
Crystal Habit: Prismatic
Cleavage: Perfect, Perfect, None
Luster: Vitreous - Pearly
Color: colorless, white
Streak: white
Class: Monoclinic - Prismatic
Hardness: 4

Special Info: Type Locality

On Dakota Matrix: Previously Sold Krauskopfite
On Dakota Matrix: Other Available Krauskopfite
WebMineral: View Krauskopfite
Mindat: View Krauskopfite

SOLD

Macdonaldite

#PD42276

Details
Data
Provenance
Resources

Locality: Big Creek, Fresno Co., California, United States
Formula: BaCa₄Si₁₆O₃₆(OH)₂·10H₂O
Availability: Sold
Size: 3 x 1.5 x 1 cm - Thumbnail
Special Info: Type Locality

Slender, acicular colorless crystals to around 1mm. Very rare. Minor Gillespite (red) in matrix on backside.

Macdonaldite

Formula: BaCa₄Si₁₆O₃₆(OH)₂·10H₂O
Crystal System: Orthorhombic
Crystal Habit: Acicular
Cleavage: Perfect, Good, Indistinct
Luster: Vitreous - Silky
Color: colorless, white
Streak: white
Class: Orthorhombic - Dipyramidal
Hardness: 3.5-4

Collection: Don Phillips Collection
Special Info: Type Locality

Mineralpedia: View Macdonaldite
On Dakota Matrix: Previously Sold Macdonaldite
On Dakota Matrix: Other Available Macdonaldite
WebMineral: View Macdonaldite
Mindat: View Macdonaldite

Maskelynite

#54988

$60.00 - Available
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Details
Provenance
Resources

Locality: Manicouagan Crater, Mont de Bablel, Quebec, Canada
Availability: Available
Price: $60.00
Size: 6 x 4 x 1 cm - Sm Cabinet

Not an IMA approved mineral as it is actually a fused product of a meteorite fall. It is essentially a glassy pseudomorph after plagioclase. A document can be found in the American Mineralogist Jan-Feb V52.

On Dakota Matrix: Previously Sold Maskelynite
On Dakota Matrix: Other Available Maskelynite
WebMineral: View Maskelynite
Mindat: View Maskelynite

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