Dakota Matrix Minerals – Crystal and mineral specimens such as gold for the earth science student.

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Bournonite #21305
Machacamarca Dist., , Potosí Dept.,, Bolivia
Chemical Formula: PbCuSbS3
Size: Miniature
Steel grey crude crystals some showing typical cogwheel twinning. Interesting specimen with associated Siderite and possible Anglesite.
Overall: 4 x 3 x 3 cm
Available
$55.00
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Brazilianite #RE6759
Chandlers Mills, New Hampshire, United States
Chemical Formula: NaAl3(PO4)2(OH)4
Crude crystal with one good face. Good reprentation from this hard to get locality. Overall 2x2cm x 5mm.
Available
$20.00
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Brazilianite #23961
Corrego Frio, near Linopolis, Minas Gerias, Brazil
Chemical Formula: NaAl3(PO4)2(OH)4
Size: Sm Cabinet
The photos do not do this specimen justice, however it is a highly lustrous, deep yellowish green specimen with multiple faces. It has no damage and is actually a floater. The overall specimen is an aggregate of at least six crystals, the largest is about 2.5 x 2cm.
Overall: 6 x 3 x 2.5 cm
Available
$950.00
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Brewsterite - Sr #24476
Whitesmith Mine, Strontian, Argyllshire, Scotland, United Kingdom
Chemical Formula: (Ba,Sr)Al2Si6O16•5(H2O)
Size: Miniature
Colorless stubby prismatic Brewsterite - Sr crystals to 2.5mm lining a vug with minute brown hemispheres of an unidentified mineral all over the Brewsterite - Sr. This is an excellent example from the district where Brewsterite - Sr type locality is located.
Overall: 4 x 2.5 x 3 cm
Available
$95.00
$80.00
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Brochantite #25870
Sounion Mine No.16, Laurion Dist., Attika, Greece
Chemical Formula: Cu4(SO4)(OH)6
Size: Thumbnail
Green bladed Brochantite crystals to 1.5mm lining vugs in matrix.
Overall: 3 x 3 x 2.5 cm
Available
$40.00
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Brochantite #GJ26815
Omega Mine, Pima Co., Arizona, United States
Jungles Collection
Chemical Formula: Cu4(SO4)(OH)6
Size: Thumbnail
Lustrous dark green flat-lying Brochantite crystals to 1m covering vuggy areas of matrix.
Overall: 3 x 2.5 x 2.5 cm
Available
$30.00
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