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Dave Crosby's Mindat Home Page

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Dave Crosby's Mindat Home Page

Registered member since 9th Feb 2011

Dave Crosby has uploaded:
101 Mineral Photos
57 Locality Photos
76 Other Photos

Dave has published 19 articles on  RSS Link to blog for Dave Crosby
As a child in Austin Texas I was always picking up rocks and wondering "What is this?"

One of my grade school teachers had a large pyrite cube on her disk. Thus I learned my first mineral name and began collecting, trying to find the names of each one.
Somehow over time all my early treasures dribbled into oblivion.

In 1955 I stared taking geology classes at BYU in Provo Utah where I learned many mineral and rock names and how to identify them. Something I think every school child should be blessed with.

Visiting poor families in Artigas Uruguay in 1957 I saw numerous beautiful amygdule chunks with thin green outer shells and the interior covered with large amethyst crystals from the surrounding countryside being used as door stops. I was given one as a gift. I had no choice. My serious collecting began.

How can anyone be bored being in the beautifully fantastic universe we are in?


Favourite Photos

M91-RK6Silver : Ag, Acanthite : Ag2S

Lujiang Co., Hefei Prefecture, Anhui Province, China

Dimensions: 10 cm x 3.5 cm x 1 cm

10.0 x 3.5 x 1.0 cm

Location was given as the Huangtongxiang Mine

John Stolz collection
Photo ID: 546779     Uploaded by: John Stolz   View Count: 160   Approval status: Public galleries    Type: Photo - 900 x 900 pixels (0.8 Mpix)

TMY-79X(No Title)

Wanda mines, Iguazú department, Misiones, Argentina

Mineral in situ: Quarry which removes geodes.
Photo ID: 532793     Uploaded by: Raúl Jorge Tauber Larry   View Count: 364   Approval status: Public galleries    Type: Photo - 960 x 720 pixels (0.7 Mpix)

UG6-RJ0Calcite : CaCO3, Chalcopyrite : CuFeS2

Viburnum No. 29 Mine, Viburnum Trend District, Washington Co., Missouri, USA

Dimensions: 10 cm x 11 cm x 7 cm


Size: 10x11x7cm

Photo ID: 523123     Uploaded by: Jeffrey Taylor   View Count: 283   Approval status: Public galleries    Type: Photo - 4288 x 3216 pixels (13.8 Mpix)

8WU-DDUQuartz (Var: Amethyst) : SiO2, Calcite : CaCO3, Hematite : Fe2O3

Multiple photos available
Artigas, Artigas Department, Uruguay

Scalenohedral Calcite crystals with a very well marked and sharp interpenetration twin of two rhombohedrons streamlined by oriented micro-crystals of Hematite. The Calcite is implanted on a cavity of Quartz (amethyst) crystals with an intense luster and a deep color.
Cantera La Bolsa, Paraje La Bolsa, Artigas, Uruguay.
Found in 06/2009
Specimen size: 16.5 × 15 × 6.8 cm = 6.5” × 5.9” × 2.7”
Main crystal size: 5 × 3.1 cm = 2.0” × 1.2”
Minor fluorescence long & short UV
Copyright: ©      Photo ID: 523060     Uploaded by: Jordi Fabre   View Count: 433   Approval status: Public galleries    Type: Photo - 674 x 840 pixels (0.6 Mpix)

C80-8C6Fluorite : CaF2

Hunan Province, China

Dimensions: 19 cm x 7.1 cm x 1 cm

19.0 x 7.1 x 1.0 cm. A beautiful and striking polished large slice of banded fluorite from Hunan Province, China. The pretty transparent to translucent bands of color include yellows and shades of purples, greens and blues. The density contrast of the bands and colors is striking on this slab. Weighs 362 grams.
Copyright: © Rob Lavinsky      Photo ID: 522931     Uploaded by: Robert Lavinsky   View Count: 234   Approval status: Public galleries    Type: Photo - 465 x 215 pixels (0.1 Mpix)

X3X-5GKCalcite : CaCO3, Hematite : Fe2O3

Davis, Murray Co., Oklahoma, USA

Dimensions: 3.8 cm x 3.1 cm x 2.9 cm

3.8 x 3.1 x 2.9 cm. A very rare, outstanding and striking calcite specimen from the Arbuckle Mountains of Oklahoma. The artistic cluster of glassy, transparent calcite rhombs has striking phantoms formed by a rich speckling of variably-colored brown hematite spheres. The impressive, well-placed, large rhomb at the crest is 2.6 cm on the diagonal and has a stunning phantom. Ex. Allen Graffham Collection.
Copyright: © Rob Lavinsky      Photo ID: 522880     Uploaded by: Robert Lavinsky   View Count: 254   Approval status: Public galleries    Type: Photo - 465 x 463 pixels (0.2 Mpix)

UJU-QUKGalena : PbS

Alexander Shaft, Vrančice, Příbram, Central Bohemia Region, Bohemia, Czech Republic

xtl size 1,2 mm; Chris Auer photo and collection, self collected in 1992
Copyright: © AC      Photo ID: 517258     Uploaded by: Christian Auer   View Count: 221   Approval status: Public galleries    Type: Photo - 1280 x 960 pixels (1.2 Mpix)

NQE-V4KMagnetite : Fe2+Fe3+2O4

Three Peaks, Iron Springs District, Iron Co., Utah, USA

Dimensions: 2 cm x 2 cm x 1.6 cm

2.0x2.0x1.6 cm
Copyright: ©      Photo ID: 517144     Uploaded by: Luciana Barbosa   View Count: 648   Approval status: Public galleries    Type: Photo - 450 x 436 pixels (0.2 Mpix)

Chinle Formation

Petrified Forest, Petrified Forest National Monument, Apache Co., Arizona, USA

Most of the rocks in Petrified Forest National Park are part of the Chinle Formation. During the Triassic, this area was a broad plain across which rivers flowed. Like rivers today, trees fell into the water, were transported, and eventually buried in sediment. Fortuitously, volcanic ash was blown into the area ever so often and was deposited on these river sediments. The ash provided the silica needed to fossilise the logs as they decomposed. Many different fossils are found in the park, including conifers, lycopsids, ferns, cycads, and ginkgoes, as well as vertebrates such as phytosaurs and amphibians.

Photo taken: 13 March 2009

Camera: Nikon FM10
Film: Fuji Superia 200
Copyright: © Nathalie Nicole Brandes      Photo ID: 508978     Uploaded by: Nathalie Brandes   View Count: 312   Approval status: Public galleries    Type: Photo - 1784 x 1194 pixels (2.1 Mpix)

XGN-M54Calcite : CaCO3, Prehnite : Ca2Al2Si3O10(OH)2, Pectolite : NaCa2(HSi3O9)

Prospect Quarry, Prospect, Cumberland Co., New South Wales, Australia

Dimensions: 72 mm x 67 mm x 52 mm

Honey coloured Calcite xls on cream pale honey coloured Prehnite on Dolerite.
The specimen actually demonstrates different stages of mineral growth, an olivine rich dolerite, followed by a thin layer of green Prehnite (13mm thick), followed by a very thin layer (about 1mm thick) of white Pectolite needles (not visible in this view) lying horizontally over the Prehnite, then a thicker layer of honey coloured mammillary Prehnite (20mm thick) and then numerous Calcite xls from 1mm up to 27mm x 18mm perched on top.

Some minor bruising to a couple of the Calcite xls.

Oveall size: 72mm x 67mm x 52mm
Copyright: © Keith F Compton      Photo ID: 507950     Uploaded by: Keith Compton   View Count: 382   Approval status: Public galleries    Type: Photo - 1736 x 1736 pixels (3.0 Mpix)
Photos 1 to 10 of 180
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