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Richard Gibson's Photo Gallery

EW7-5Y8Chromite

Fethiye, Muğla Province, Aegean Region, Turkey

Field of View: 8 mm

Chromite crystals. The one near center is about 1 mm. The greenish matrix is probably brucite.
Photo ID: 945092     Uploaded by: Richard Gibson   View Count: 13   Approval status: Public galleries    Type: Photo - 2988 x 5312 pixels (15.9 Mpix)

X85-M9LKidney and Gallstones, Struvite

The Earth

Field of View: 4 mm

Struvite crystals in a cavity in a human kidney stone. The substrate is more massive struvite mixed with some apatite. FOV 6 x 4 mm. ID by x-ray diffraction.
Photo ID: 917483     Uploaded by: Richard Gibson   View Count: 27   Approval status: Public galleries    Type: Photo - 520 x 787 pixels (0.4 Mpix)

HUD-VPFWulfenite

Mayflower prospect, Norwegian Mining District, Madison Co., Montana, USA

Field of View: 25 mm

Tan wulfenite on bluish quartz.
Photo ID: 872218     Uploaded by: Richard Gibson   View Count: 45   Approval status: Public galleries    Type: Photo - 918 x 1632 pixels (1.5 Mpix)

H5T-KJYCalderónite

Mayflower prospect, Norwegian Mining District, Madison Co., Montana, USA

Field of View: 5.5 mm
Largest Crystal Size: 1.0 mm

Calderonite was confirmed by multiple SEM-EDX analyses by Stan Korzeb, Economic Geologist at the Montana Bureau of Mines & Geology, Butte, Montana. It is associated with descloizite in the same specimen and vanadinite in rocks from the same location. The calderonite in these rocks ranges from typical sub-vitreous red-orange to earthy brick red, which is probably partly altered to some iron oxide.

Mineralization here is hosted in the oolitic facies of the Cambrian Meagher limestone. Ore fluids probably came in along several faults, including especially the Mayflower Fault, which juxtaposes Precambrian Belt Supergroup rocks and Cambrian rocks over Cretaceous Elkhorn Mountains Volcanics. The mine reached a depth of 1,582 feet and produced gold from tellurides, primarily in the 1896-1912 time frame, when it was owned by W.A. Clark. Total production was at least 225,000 ounces of gold and 880,000 ounces of silver.
Photo ID: 872207     Uploaded by: Richard Gibson   View Count: 55   Approval status: Public galleries    Type: Photo - 2666 x 3063 pixels (8.2 Mpix)

MP9-4YHVesuvianite

Delmoe Road skarn, Delmoe Lake Road occurrences, Pipestone Mining District, Jefferson Co., Montana, USA

Field of View: 14 mm

Crude vesuvianite crystals to 3-4 cm are common at this location, but sharp crystals are uncommon. This one is 8 mm vertically. It is in white scapolite (meionite).
Photo ID: 850686     Uploaded by: Richard Gibson   View Count: 37   Approval status: Public galleries    Type: Photo - 1581 x 1777 pixels (2.8 Mpix)

R92-HT6Axinite Group, Epidote, Clinochlore

Railroad Cut, Delmoe Lake Road occurrences, Pipestone Mining District, Jefferson Co., Montana, USA

Dimensions: 42 mm x 34 mm x 36 mm
Largest Crystal Size: 3 mm

The lower part of the photo shows green epidote typical from this location. Immediately above the epidote is massive vitreous lavender axinite. Just above middle center are two butterfly-shaped axinite crystals that are almost completely filled with dark green clinochlore inclusions, typical of axinite here (the "largest crystal size - 3 mm" refers to this pair of crystals).

The clinochlore has not been analyzed, but it is green flaky plates and vermicular chains - certainly some chlorite-group mineral, and probably clinochlore. It could be debated whether this should be called a pseudomorph of clinochlore after axinite, but I think it is axinite including clinochlore rather than being replaced by clinochlore. Microscopically, the butterfly-shaped crystals are still obvious axinite, even though they are almost filled up with the clinochlore.

White in the photo is a feldspar, and the purplish-brown material to the right of the "butterfly" is also axinite with variable amounts of included clinochlore.
Photo ID: 850684     Uploaded by: Richard Gibson   View Count: 34   Approval status: Public galleries    Type: Photo - 1377 x 2448 pixels (3.4 Mpix)

0EM-9G4Apatite, Epidote, Schorl

Railroad Cut, Delmoe Lake Road occurrences, Pipestone Mining District, Jefferson Co., Montana, USA

Field of View: 6 mm
Largest Crystal Size: 1 mm

The white crystal of apatite (confirmed by Raman spectroscopy) is one of seven in a cavity 25 x 30 mm across within an altered rock that is probably part of the Cretaceous Elkhorn Mountains Volcanics along this contact zone with the Butte Pluton of the Boulder Batholith. The apatite is with black schorl and yellow-green epidote, and elsewhere in this specimen are two tiny titanite crystals. The cavity is in a sub-horizontal fracture extending more than a meter across the outcrop; the fracture is mostly lined with schorl. This apatite shows the hexagonal prism and basal pinacoid - it isn't broken on the ends.

"Largest crystal size - 1 mm" refers to the apatite.
Photo ID: 850676     Uploaded by: Richard Gibson   View Count: 50   Approval status: Public galleries    Type: Photo - 4608 x 3456 pixels (15.9 Mpix)

JPH-YVNMicrocline, Epidote

Railroad Cut, Delmoe Lake Road occurrences, Pipestone Mining District, Jefferson Co., Montana, USA

Dimensions: 102 mm x 61 mm x 49 mm

Microcline from a small pegmatite, with a druzy coating of green epidote on the top (plus brown iron oxide). This is from one of several pegmatites about three to 4 feet across, about 10-15 meters east of (above) the railroad cut itself. They are probably within granite of the Butte Pluton that intrudes Cretaceous Elkhorn Mountains Volcanics. If that's the case, then the railroad cut is probably an endoskarn (altered rocks within the granite), but this zone may reflect multiple injections of granite into the volcanics, so the mafic skarn here may be in the volcanics rather than the granite. The zone between definite granite and definite volcanics is about 50-60 meters wide.
Photo ID: 850674     Uploaded by: Richard Gibson   View Count: 46   Approval status: Public galleries    Type: Photo - 614 x 1000 pixels (0.6 Mpix)

40E-N9TStilbite subgroup, Meionite

Delmoe Road skarn, Delmoe Lake Road occurrences, Pipestone Mining District, Jefferson Co., Montana, USA

Field of View: 30 mm

Radial sheafs of stilbite and elongate prisms of meionite. Both were identified by XRD, but the stilbite could not be specified as -Na or -Ca. Since it is in a zone of metasomatized carbonate rocks, -Ca is more likely and consistent with the overall chemistry of this part of the skarn.
Photo ID: 850672     Uploaded by: Richard Gibson   View Count: 48   Approval status: Public galleries    Type: Photo - 1836 x 3264 pixels (6.0 Mpix)

FPR-TRUAxinite Group, Epidote

Railroad Cut, Delmoe Lake Road occurrences, Pipestone Mining District, Jefferson Co., Montana, USA

Field of View: 18 mm
Largest Crystal Size: 5.5 mm

Vitreous lavender axinite with green epidote. The specimen also has clinochlore, quartz, and biotite.
Photo ID: 850664     Uploaded by: Richard Gibson   View Count: 42   Approval status: Public galleries    Type: Photo - 1453 x 1427 pixels (2.1 Mpix)
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