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Erin Delventhal's Photo Gallery

A15-7ANMalachite, Quartz

Piedmont Mine, Brooklyn Peak, Yavapai Co., Arizona, USA

Dimensions: 4.2 cm x 4.0 cm x 2.9 cm

Quartz perimorphing several fairly sharp rhombohedral crystals of malachite pseudomorphs after azurite.
The green coloration of the malachite does not show through the quartz, but the quartz is broken on the edges of a few crystals, revealing the malachite interior.

Acquired February 4, 2019 from Shannon & Sons Minerals, reported to have previously been in David Shannon's collection, but without any accompanying personal label.
Copyright: © Erin Delventhal      Photo ID: 948626     Uploaded by: Erin Delventhal   View Count: 32   Approval status: Public galleries    Type: Photo - 2978 x 2978 pixels (8.9 Mpix)

2DX-688Brannerite, Rutile, Quartz

Mt White, Chaffee Co., Colorado, USA

Dimensions: 6.269 cm x 3.553 cm x 1.737 cm
Largest Crystal Size: 0.9 cm

A single needle-like crystal of brannerite locked in massive quartz with a distinct radiation halo surrounding the crystal. Associated with a shattered rutile (rumored to be niobium-bearing, but as of yet unconfirmed) crystal, seen in the upper left of the image, further evidencing the titanium content. The occurrences of the rutile, and more rarely, brannerite seemed to be concentrated along contacts between massive quartz and feldspar. Collected August, 2018.
Copyright: © Erin Delventhal      Photo ID: 943214     Uploaded by: Erin Delventhal   View Count: 19   Approval status: Public galleries    Type: Photo - 4608 x 3072 pixels (14.2 Mpix)

WGP-R35Quartz (Var: Chalcedony)

Deming, Luna Co., New Mexico, USA

Dimensions: 5.1 cm x 3.6 cm x 2.3 cm

Sculptural mounds of chalcedony, ranging in color from pink to golden/amber to colorless. The golden/amber regions are reminiscent of fire agate, but do not show any color play in this specimen.

Collected by and gift from Philip Simmons.
Copyright: © Erin Delventhal      Photo ID: 940795     Uploaded by: Erin Delventhal   View Count: 43   Approval status: Public galleries    Type: Photo - 2805 x 3447 pixels (9.7 Mpix)

TM0-2FJPyrrhotite

Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai, Russia

Dimensions: 4.7 cm x 4.5 cm x 3.6 cm

Grouping of pyrrhotite crystals; the larger crystals feature a rim of smaller rosettes of pyrrhotite. Some areas of specimen show an iridescent tarnish. Minor pyrite and quartz associated.
Ex. Rock H. Currier Collection No. 6023; acquired February 1, 2019.
Copyright: © Erin Delventhal      Photo ID: 940315     Uploaded by: Erin Delventhal   View Count: 27   Approval status: Public galleries    Type: Photo - 3271 x 3192 pixels (10.4 Mpix)

EP9-F6XCalcite

Camp Verde, Camp Verde Mining District, Yavapai Co., Arizona, USA

Dimensions: 6.048 cm x 3.467 cm x 3.414 cm

A sharp calcite cast after glauberite.
Copyright: © Erin Delventhal      Photo ID: 928084     Uploaded by: Erin Delventhal   View Count: 26   Approval status: Public galleries    Type: Photo - 3595 x 3595 pixels (12.9 Mpix)

8E1-LNQQuartz (Var: Chalcedony)

Kismantoro District, Wonogiri Regency, Central Java Province, Java, Indonesia

Dimensions: 9.9 cm x 7.2 cm x 7.0 cm

A tan-grey chalcedony epimorph after an unknown mineral, though the predecessor once had distinct twinned orthorhombic crystals - aragonite and cerussite are contenders in the debate, but more study is needed to confirm. No original material appears to remain.

Banded chalcedony rims visible on the lower portion of the image show alternating generations of chalcedony and at least one missing mineral.
Copyright: © Erin Delventhal      Photo ID: 927395     Uploaded by: Erin Delventhal   View Count: 29   Approval status: Public galleries    Type: Photo - 2448 x 2448 pixels (6.0 Mpix)

9R0-HQLGalena, Cerussite, Quartz

Cookes Peak District, Luna Co., New Mexico, USA

Dimensions: 3.7 cm x 3.1 cm x 1.9 cm

Galena crystal with surface alteration to cerussite and minor quartz.
Copyright: © Erin Delventhal      Photo ID: 888196     Uploaded by: Erin Delventhal   View Count: 45   Approval status: Public galleries    Type: Photo - 1801 x 2248 pixels (4.0 Mpix)

HEJ-NPFFluoro-richterite

Wilberforce area, Haliburton Co., Ontario, Canada

Dimensions: 2.1 cm x 1.8 cm x 1.0 cm

Dark green doubly-terminated single crystal of fluoro-richterite.



Acquired March 2017 from Mama's Minerals in Albuquerque, New Mexico.
Copyright: © Erin Delventhal      Photo ID: 887358     Uploaded by: Erin Delventhal   View Count: 75   Approval status: Public galleries    Type: Photo - 1585 x 1731 pixels (2.7 Mpix)

MKD-98YFluorite

Stoneco Auglaize Quarry, Junction, Paulding Co., Ohio, USA

Dimensions: 2.7 cm x 2.6 cm x 1.4 cm

Root beer brown fluorite with blue surface irridescence.



Acquired as a gift from Cut Edge Gems at the Gem and Jam Festival in Tucson.
Copyright: © Erin Delventhal      Photo ID: 887356     Uploaded by: Erin Delventhal   View Count: 66   Approval status: Public galleries    Type: Photo - 1914 x 1972 pixels (3.8 Mpix)

XG2-P4UPyrrhotite, Quartz, Galena, Pyrite

Nikolaevskiy Mine, Dalnegorsk, Dalnegorsk Urban District, Primorsky Krai, Russia

Dimensions: 15.0 cm x 6.9 cm x 5.2 cm

Large tarnished "books" of pyrrhotite accentuated by clusters of white quartz and galena.

 One area of pyrrhotite is partially pseudomorphed to pyrite.

Acquired from Jeff Self and Donna Ware in exchange for working their booth at the 2016 Denver Gem & Mineral Show.
Copyright: © Erin Delventhal      Photo ID: 887346     Uploaded by: Erin Delventhal   View Count: 67   Approval status: Public galleries    Type: Photo - 3989 x 1953 pixels (7.8 Mpix)
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