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John Christian's Photo Gallery

DU0-WUAMyalina (Myalina)

Kohl’s Ranch fossil locality, Gila Co., Arizona, USA

Dimensions: 59 mm x 30 mm x 21 mm

This is a Myalina (Myalina) nacoensis bivalve with both shells collected from the Pennsylvanian Naco Formation. It probably was buried during a storm or slide event.
Photo ID: 1067573     Uploaded by: John Christian   View Count: 10   Approval status: Public galleries    Type: Photo - 1280 x 631 pixels (0.8 Mpix)

X5R-2DPActinocoelia maeandrina

Calf Pen East, Coconino County, Arizona, USA

Field of View: 6.5 cm

Actinocoelia maeandrina sponge from the Kaibab Formation
This silicified sponge can be very common in the Kaibab Fm. It is a good index fossil for marine Kungarian (Leonardian) Age rocks especially in the western USA.


Griffin, L. R. (1966). Actinocoelia maeandrina Finks, from the Kaibab limestone of Northern Arizona. Provo: Brigham Young University. 13: 105-108.
Photo ID: 1056638     Uploaded by: John Christian   View Count: 7   Approval status: Public galleries    Type: Photo - 2516 x 1536 pixels (3.9 Mpix)

Calf Pen East map

Calf Pen East, Coconino County, Arizona, USA

This is a crude map of the Calf Pen East locality in Coconino County, Arizona. The Permian Kaibab Formation crops out in the area and contains fossils. Hopefully we will replace this with a digital version on another map base.
Photo ID: 1056635     Uploaded by: John Christian   View Count: 8   Approval status: Public galleries    Type: Photo - 2048 x 1603 pixels (3.3 Mpix)

691-QGMCalcite CaCO3

Seven Springs Onyx Mine, Maricopa Co., Arizona, USA

Field of View: 90 mm

Iron mineral stained calcite onyx.
Photo ID: 1051027     Uploaded by: John Christian   View Count: 14   Approval status: Public galleries    Type: Photo - 1655 x 2048 pixels (3.4 Mpix)

93N-QR6Azurite Cu3(CO3)2(OH)2 , Malachite Cu2(CO3)(OH)2

Mormon Lake Uranium claims, Gila Co., Arizona, USA

Dimensions: 5.3 mm x 3.5 mm x 2 mm
Field of View: 5.7 mm

Copper minerals occur with carbonized plant fossils along with pitch blend. Not enough uranium or copper was found to continue mining. The carbonized Pennsylvanian/Permian plant fossils are the most interesting thing at this site; some with copper minerals.
Photo ID: 1050743     Uploaded by: John Christian   View Count: 25   Approval status: Public galleries    Type: Photo - 2296 x 1536 pixels (3.5 Mpix)

29V-ADDChrysocolla Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Quien Sabe Mine, New River Mesa, New River Mining District, Maricopa Co., Arizona, USA

Field of View: 88 mm

Some of the chrysocolla is well silicified.
Photo ID: 1048539     Uploaded by: John Christian   View Count: 11   Approval status: Public galleries    Type: Photo - 2048 x 1734 pixels (3.6 Mpix)

HL0-UP3Malachite Cu2(CO3)(OH)2 , Chrysocolla Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O , Hematite Fe2O3

Quien Sabe Mine, New River Mesa, New River Mining District, Maricopa Co., Arizona, USA

Field of View: 9.5 cm

This is a much richer than average piece of ore.

Green fibrous malachite the fizzes with HCl acid.
Bluish chrysocolla that sticks to tongue.
Reddish earthy hematite with reddish streak.
Gangue of quartz breccia and light colored soft clay.
Photo ID: 1048538     Uploaded by: John Christian   View Count: 10   Approval status: Public galleries    Type: Photo - 3293 x 2191 pixels (7.2 Mpix)

Mostly Covered Adit

Quien Sabe Mine, New River Mesa, New River Mining District, Maricopa Co., Arizona, USA

This mostly covered adit appears to be the main feature of the mine based on the debris pile below. The adit is about 0.1 miles south of Trail 246 at the end of a dirt road. There are two or three shallow cuts exposing ore to the east and a shallow pit along the north side of Trail 246.

Chrysocolla, malachite and minor azurite are in schist and other metamorphic rocks of Proterozoic age.

It is surprising that no history on this mine can be found. Who knows if they found valuable ore or other metals. The name Quien Sabe graces nearby springs and a peak. I do not know what was named after what. Visit the nearby springs that are a nice oasis in a rather dry area.
Photo ID: 1048178     Uploaded by: John Christian   View Count: 33   Approval status: Public galleries    Type: Photo - 4032 x 3024 pixels (12.2 Mpix)

R2Y-KVCEnsiferites brandenburgi

Multiple photos available
Brandenburg Mountain, Pinal Co., Arizona, USA

Dimensions: 60 mm x 64 mm x 20 mm
Field of View: 61 mm

This is a Late Devonian, Famennian Age calcareous sponge from the Percha Formation that was collected from the type locality on Brandenburg Mountain in Pinal County, Arizona, USA. It has the largest complete top of any reported species of its type. Notice star shaped spicules when you zoom in on the photo.

This sponge was first published in:

Rigby, J. Keith, et al. “The Genus Ensiferites, a Devonian Astraeosponge of North America.” Journal of Paleontology, vol. 53, no. 2, 1979, pp. 475–493.
Photo ID: 1048091     Uploaded by: John Christian   View Count: 52   Approval status: Public galleries    Type: Photo - 2005 x 2048 pixels (4.1 Mpix)

67A-TLMCinnabar HgS

Cragmont Mine, Cragmont neighborhood, Berkeley, Alameda Co., California, USA

Dimensions: 78 mm x 70 mm x 30 mm

This piece of cinnabar occurs in silicified and brecciated Northbrae Rhyolite. Noted University of California educated mineralogist, Charles Palache, found similar cinnabar in the Northbrae Rhyolite in this general area. Palache considered buying a very small piece of property containing the cinnabar from the giant parcel owned by a railroad company. Palache did not buy the property because it would be obvious that there was a mercury deposit once the owner went to the site.

Small quantities of cinnabar in Northbrae Rhyolite are found throughout North Berkeley.
Copyright: © John Christian      Photo ID: 777676     Uploaded by: John Christian   View Count: 112   Approval status: Public galleries    Type: Photo - 939 x 1024 pixels (1.0 Mpix)
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