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John Collins' Photo Gallery

EVH-ET7Rhodochrosite, Sphalerite, Quartz, Pyrite, Fluorite

Wutong Mine, Liubao, Cangwu Co., Wuzhou, Guangxi, China

Dimensions: 10 cm x 7.0 cm x 5.0 cm
Weight: 380.0 g

A beautiful cave-like vug of clean crystals.
Photo ID: 909320     Uploaded by: John Collins   View Count: 21   Approval status: Public galleries    Type: Photo - 4000 x 3000 pixels (12.0 Mpix)

L3A-F1TFerberite, Quartz

Panasqueira Mines, Covilhã, Castelo Branco, Portugal

Dimensions: 6.0 cm x 4.7 cm x 3.4 cm
Weight: 271.3 g

Dense multifaceted crystals of ferberite with many stepped crystal faces. The {010} crystal faces show nice striations. Minor quartz is visible here and there. Collected around 1980 according to the provenance documents. Panasqueira #2 Mine.
Now in the collection of John R. Collins
Photo ID: 886527     Uploaded by: John Collins   View Count: 64   Approval status: Public galleries    Type: Photo - 2248 x 4000 pixels (9.0 Mpix)

A1F-5NLGormanite, Siderite, Eosphorite

Rapid Creek, Dawson mining district, Yukon, Canada

Dimensions: 9.2 cm x 4.5 cm x 3.0 cm
Largest Crystal Size: 6 mm
Weight: 132 g

Sprays of green Gormanite crystals in a siderite vug with white Esophorite needles above and brown Siderite rhombohedrons below and on the ends, all in an iron shale matrix.
Purchased from David K Joyce in honour of my U of Toronto mineralogy professor Donald "Digger" Gorman. David did not know the exact camp in the area from which this specimen was obtained.

Photo ID: 858841     Uploaded by: John Collins   View Count: 45   Approval status: Public galleries    Type: Photo - 4000 x 2248 pixels (9.0 Mpix)

D68-2UXPyrrhotite, Galena, Quartz

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

Dimensions: 5.8 cm x 5.2 cm x 3.0 cm
Weight: 99.0 g

Spectacular group of nicely layered hexagonal pyrrhotite crystals and spinel twin galena crystals with minor quartz crystals.
Photo ID: 853803     Uploaded by: John Collins   View Count: 45   Approval status: Public galleries    Type: Photo - 4000 x 2248 pixels (9.0 Mpix)

4AQ-5TETillite, Quartzite

Algoma District, Ontario, Canada

Dimensions: 11 cm x 8 cm x 10 cm
Weight: 1.3 kg

The photo shows a glacial drop stone (pink quartzite) deposited in Precambrian Huronian Age tillite. It fell from the bottom of an ancient glacier into a slow moving stream flowing over the clay bed. Just above and to the right of the granite there is a later and smaller drop stone slightly lighter in coloring from the clay. The distortion of the clay deposition around the boulder suggests the stream flow under the ice was from left to right.
I found this loose piece at a road cut at 46° 26' 55" N, 83° 44' 01" W north of Bruce Mines, Algoma District, Ontario while exploring road-cuts with our friend Betty Buchanan who lives in Huron Shores. Nice roadside view with Google Earth at the above coordinates. The size of the tillite fragment is 11 x 8 cm and the quartzite pebble has a diameter of about 2 cm.
Thanks to W. Richard Gunter, Ed Clopton, Woody Thompson, Paul Brandes for assistance with the descriptive notes.

Mindat.org Photo of the Day - 18th Sep 2017
Photo ID: 842552     Uploaded by: John Collins   View Count: 521   Approval status: Public galleries    Type: Photo - 4000 x 3000 pixels (12.0 Mpix)

19H-L5TMillerite, Pentlandite

Coleman Mine, Levack Township, Sudbury District, Ontario, Canada

Dimensions: 9.5 cm x 7.5 cm x 4.9 cm
Largest Crystal Size: 2.5 cm
Weight: 547 g

Massive pentlandite with cleaved millerite from the copper footwall veins of the North Range of the Sudbury Igneous complex. The form of millerite was confirmed by me using calculations based on sunlight reflections off the two cleavage faces seen in the photo.
[I measured/calculated 143° while the accepted value is 144°, so close enough.]

Roger (Rogersminerals.com) who sold this item to me stated that this specimen was from a deep section of the orebody in the Coleman Mine and perhaps the chemistry at this depth is different from the shallower orebody mineralization.
Photo ID: 800956     Uploaded by: John Collins   View Count: 206   Approval status: Public galleries    Type: Photo - 4000 x 3000 pixels (12.0 Mpix)

P0X-226Coronadite, Crocoite, Gibbsite

Adelaide Mine, Dundas mineral field, Zeehan District, West Coast municipality, Tasmania, Australia

Dimensions: 7.3 cm x 7.0 cm x 5.5 cm
Largest Crystal Size: 1.0 cm
Weight: 78.2 g

Black coronadite and brown gibbsite covered with orange acicular crocoite crystals to 1 cm in length.
Photo ID: 797657     Uploaded by: John Collins   View Count: 109   Approval status: Public galleries    Type: Photo - 4000 x 3000 pixels (12.0 Mpix)

7DK-73WNiobophyllite, Aegirine

Mount Malosa, Zomba, Southern Region, Malawi

Dimensions: 2.9 cm x 1.8 cm x 1.7 cm
Largest Crystal Size: 8 mm
Weight: 11.5 g

Laminar light brown crystals of niobophyllite, with scattered bladed very dark green aegerine on a section of feldspar. The mass given (11.5 g) is approximate due to the tack and glue and the specimen base.
Photo ID: 797301     Uploaded by: John Collins   View Count: 126   Approval status: Public galleries    Type: Photo - 3000 x 4000 pixels (12.0 Mpix)

GTE-C7PCuprite, Limonite, Hematite

Tieshan Fe-Cu deposit, Tieshan District, Huangshi, Hubei, China

Dimensions: 6 cm x 4 cm x 3.4 cm
Field of View: 1.3 cm
Largest Crystal Size: 2 mm
Weight: 102.6 g

Octahedrons of translucent cuprite spread on a matrix of limonite and hematite.
Photo ID: 794485     Uploaded by: John Collins   View Count: 76   Approval status: Public galleries    Type: Photo - 2129 x 1296 pixels (2.8 Mpix)

10Y-CG4Mookaite

Mooka Station, Carnarvon Shire, Western Australia, Australia

Dimensions: 7.5 cm x 6.0 cm x 5.0 cm
Weight: 207 g

The black mineral is hard (about 5.5) and produces a dark red streak typical of hematite. The brown mineral stain on some surfaces adjoining the hematite may be from goethite.
Photo ID: 793843     Uploaded by: John Collins   View Count: 96   Approval status: Public galleries    Type: Photo - 4000 x 3000 pixels (12.0 Mpix)
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