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Dean Allum's Photo Gallery

WJW-XQTZircon : Zr(SiO4)

St Peters Dome, Cheyenne District, El Paso Co., Colorado, USA

Dimensions: .02 mm x .01 mm x .01 mm
Largest Crystal Size: .005 mm
Weight: 0.0 g

Cathodoluminescence on Left, SEM on Right of thin section of hydrothermal Zircon in quartz. Courtesy of Colgate University Department of Earth Sciences.
Copyright: © Colgate University Department of Earth Sciences      Photo ID: 836505     Uploaded by: Dean Allum   View Count: 28   Approval status: Public galleries    Type: Photo - 1091 x 543 pixels (0.6 Mpix)

6CC-X4FTriplite : (Mn2+,Fe2+)2PO4(F,OH)

Multiple photos available
Mica Lode Mine, Eight Mile Park Pegmatite District, Fremont Co., Colorado, USA

Dimensions: 7.5 cm x 6 cm x 4 cm

Dimensions 7.5x6x4cm. This glassy brown/orange triplite seems to be relatively large for a phosphate. A few tiny grains of green apatite were noticed with a microscope. Unfortunately there are no crystal surfaces. There is a chance that it is actually beusite, but the 1947 Wolf/Hienrich paper called it triplite.
Photo ID: 557698     Uploaded by: Dean Allum   View Count: 252   Approval status: Public galleries    Type: Photo - 2501 x 2000 pixels (5.0 Mpix)

AH6-HNYZircon : Zr(SiO4)

St Peters Dome, Cheyenne District, El Paso Co., Colorado, USA

Crystal is 1.2cm on a side. This red-brown zircon was embedded in the quartz to which it is still attached. Collected August 2013 by Dean Allum.
Copyright: © D. Allum      Photo ID: 557661     Uploaded by: Dean Allum   View Count: 193   Approval status: Public galleries    Type: Photo - 4272 x 2848 pixels (12.2 Mpix)

L54-VDQRiebeckite : ◻Na2(Fe2+3Fe3+2)Si8O22(OH)2

St Peters Dome, Cheyenne District, El Paso Co., Colorado, USA

Dimensions: 5 cm x 3 cm x 2 cm

Crystal is 5x3x2cm. This quasi-hexogonal riebeckite prism has a nice termination which luckily came out of the quartz intact. Collect August 2013 by Dean Allum.
Copyright: © D. Allum      Photo ID: 557660     Uploaded by: Dean Allum   View Count: 215   Approval status: Public galleries    Type: Photo - 4272 x 2848 pixels (12.2 Mpix)

VT3-73HZircon : Zr(SiO4)

St Peters Dome, Cheyenne District, El Paso Co., Colorado, USA

4mm to 8mm wide crystals. These brown zircons were all found frozen in quartz. They exhibit a variety inter-grown or miss-formed shapes. Collected August 2013 by Dean Allum
Copyright: © D. Allum      Photo ID: 557659     Uploaded by: Dean Allum   View Count: 215   Approval status: Public galleries    Type: Photo - 2724 x 1532 pixels (4.2 Mpix)

5F1-JTVZircon : Zr(SiO4)

St Peters Dome, Cheyenne District, El Paso Co., Colorado, USA

1.3cm on a side. This zircon crystal has some interesting surface texture. Collected August 2013 by Dean Allum
Copyright: © D. Allum      Photo ID: 557658     Uploaded by: Dean Allum   View Count: 148   Approval status: Public galleries    Type: Photo - 1542 x 1233 pixels (1.9 Mpix)

F2Y-WHMCryolite : Na3AlF6

30-4 pegmatite, St Peters Dome, Cheyenne District, El Paso Co., Colorado, USA

Dimensions: 6.5 cm x 4.5 cm x 3 cm

6.5x4.5x3cm. This was the only cryolite I could find for the full day. This site below a scree slope along the South Cheyenne Creek has been nearly obliterated. Collected August 2013 by Dean Allum
Copyright: © D. Allum      Photo ID: 557657     Uploaded by: Dean Allum   View Count: 276   Approval status: Public galleries    Type: Photo - 2851 x 2277 pixels (6.5 Mpix)

PPX-87EGalena : PbS, Baryte : BaSO4

Missouri Mine, Hall Valley, Montezuma District, Park Co., Colorado, USA

Dimensions: 7 cm x 3.5 cm x 3.5 cm

Specimen dimensions 7x3.5x3.5cm. Bright galena frozen in baryte composed the main vein material of the Missouri mine. Collected July 2013 by Dean Allum.
Copyright: © D. Allum      Photo ID: 557656     Uploaded by: Dean Allum   View Count: 168   Approval status: Public galleries    Type: Photo - 2393 x 1921 pixels (4.6 Mpix)

HEK-Y5TZircon : Zr(SiO4)

Eureka tunnel, St Peters Dome, Cheyenne District, El Paso Co., Colorado, USA

Field Of View about 1mm.
Cathodoluminescence photos on the left and Scanning Electron Micrographs on the right of polished-sections of zircons embedded in quartz. This technique basically highlights the variation of REE element concentration within a specimen. Here it is utilized to reveal the crystal growth patterns.
Reprinted from Thesis "PETROGRAPHY OF HYDROTHERMAL ZIRCON, PIKES PEAK BATHOLITH, EL PASO COUNTY, COLORADO" by Max Ephraim, May 2013.
Copywrite Colgate University. Used with permission from Dr. William Peck.
Copyright: © Colgate University      Photo ID: 553185     Uploaded by: Dean Allum   View Count: 196   Approval status: Public galleries    Type: Photo - 873 x 775 pixels (0.7 Mpix)

V02-M1WZircon : Zr(SiO4)

Eureka tunnel, St Peters Dome, Cheyenne District, El Paso Co., Colorado, USA

Field Of View 275 microns. Cathodoluminescence photo on the left and Scanning Electron Micrograph on the right of polished-sections of zircon embedded in quartz. This technique basically highlights the variation of REE element concentration within a specimen. Here it is utilized to reveal the crystal growth pattern.
Reprinted from Thesis "PETROGRAPHY OF HYDROTHERMAL ZIRCON, PIKES PEAK BATHOLITH, EL PASO COUNTY, COLORADO" by Max Ephraim, May 2013.
Copywrite Colgate University. Used with permission from Dr. William Peck.
Copyright: © Colgate University      Photo ID: 553184     Uploaded by: Dean Allum   View Count: 343   Approval status: Public galleries    Type: Photo - 1052 x 532 pixels (0.6 Mpix)
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