Acanthite

#BN64613

SOLD

Availability: Sold

Locality: Guanajuato, Guanajuato, Mexico
Formula: Ag₂S
Size: 1.2 x 0.5 x 0.5 cm - Thumbnail
Tagged: sulfide, silver

Euhedral crystal of Acanthite with complex crystal faces.

Acanthite at Dakota Matrix Acanthite at WebMineral Acanthite at MinDat

Adamite

#57452

Availability: Available
Price: $20.00

Locality: Kamariza mine, Laurium, Greece
Formula: Zn₂AsO₄(OH)
Size: 4 x 3 x 3 cm - Miniature
Tagged: arsenate

Bright green crystals of Adamite to 1mm in large clusters.

Adamite at Dakota Matrix Adamite at WebMineral Adamite at MinDat

Agardite-(Y)

#62703

Availability: Available
Price: $30.00

Locality: Bou Skour mine, Ourzazate prov., Morocco
Formula: Cu²⁺₆Y(AsO₄)₃(OH)₆·3H₂O
Size: 1.7 x 1.5 x 1 cm - Thumbnail
Tagged: arsenate, copper
Special Info: Type Locality

Bluish green acicular crysatls in bunches to 1mm.

Agardite-(Y) at Dakota Matrix Agardite-(Y) at WebMineral Agardite-(Y) at MinDat

Alabandite

#CL62918

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Availability: Sold

Locality: Merelani Hills, Umba Valley, Lelatema Mts., Arusha, Tanzania
Formula: Mn²⁺S
Size: 3 x 3 x 2.5 cm - Thumbnail
Tagged: sulfide

Black partial large crystal.

Alabandite at Dakota Matrix Alabandite at WebMineral Alabandite at MinDat

Albite with Muscovite contact with border zone

#DL63815

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Availability: Sold

Featured: Featured in Special Editions
Locality: Harding mine, Taos Co., New Mexico, United States
Formula: NaAlSi₃O₈
Size: 18 x 10 x 8 cm - Cabinet
Tagged: pegmatite mineral
Special Info: Illustrated in London's book "Pegmatites"

This specimen from the border zone represents an example of wall-rock interaction with the pegmatite solution as it was injected into the country rock. The white portion is the pegmatite and is composed of Albite, Muscovite, Beryl. The black portion is the wall rock, which through metasomatism, was altered to Schorl tourmaline.

The specimen is illustrated in "Pegmatites" on page 123 Fig. 7-12d.

Albite at Dakota Matrix Albite at WebMineral Albite at MinDat