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David Goza's Photo Gallery

LK9-MH1Chalcedony (Var: Agate)

Multiple photos available
Cleveland Co., Oklahoma, USA

Agate, pseudomorph after aragonite. The largest piece - the one on the right - is 3 cm x 3 cm x 2.5 cm, and has been tumble-polished.

These pseudomorphs are fairly abundant in the alluvium of the Canadian River, and I have found them as far upstream as the Lake Meredith area north of Amarillo, TX. They're usually pretty beaten-up from being tossed around in the stream bed.

The more nearly disc-shaped pieces are known colloquially as "Indian money."
Copyright: © David Goza      Photo ID: 354415     Uploaded by: David Goza   View Count: 473   Approval status: Public galleries    Type: Photo - 3745 x 2232 pixels (8.4 Mpix)

ARE-TV9Chalcedony (Var: Agate)

Multiple photos available
Seminole Co., Oklahoma, USA

"Boley agate" found near Sasakwa, OK. This agate, which in its intact state was probably about the size of my fist, had apparently been run over and shattered by some of the heavy equipment that operates in the quarry. So I gathered the fragments and tumble-polished them.

The largest fragment pictured is about 6 cm x 4.5 cm x 3 cm.

The clasts are mostly feldspar; this is readily apparent in close-ups of the photos. The chalcedony cement is mostly white.
Copyright: © David Goza      Photo ID: 352841     Uploaded by: David Goza   View Count: 367   Approval status: Public galleries    Type: Photo - 4000 x 3000 pixels (12.0 Mpix)

AFA-C5VChalcedony (Var: Agate)

Multiple photos available
Seminole Co., Oklahoma, USA

"Boley agate" from Seminole County, OK, a few miles west of Sasakwa. Collected 11/05/10. Dimensions 4. cm x 2 cm x 1 cm. Tumble-polished.
Copyright: © David Goza      Photo ID: 351661     Uploaded by: David Goza   View Count: 306   Approval status: Public galleries    Type: Photo - 2150 x 1178 pixels (2.5 Mpix)

RXN-2KTChalcedony (Var: Agate)

Multiple photos available
Seminole Co., Oklahoma, USA

"Boley agate" from Seminole County, OK, a few miles west of Sasakwa. Collected 11/05/10. Dimensions 4 cm x 3.5 cm x 3.5 cm. I photographed it exactly as I found it, except for washing away the clinging soil.

In these photographs, I turn the stone edge-on through 360 degrees.
Copyright: © David Goza      Photo ID: 345364     Uploaded by: David Goza   View Count: 408   Approval status: Public galleries    Type: Photo - 2132 x 1459 pixels (3.1 Mpix)

WEW-D0UChalcedony (Var: Agate)

Multiple photos available
Seminole Co., Oklahoma, USA

"Boley agate" from Seminole County, Oklahoma, collected a few miles west of Sasakwa and tumble-polished. 3 cm x 2.7 cm x 2 cm. This stone is roughly pyramid-shaped, with two broad faces and two narrow ones.

Although this material is usually characterized as a chert breccia, most of these clasts appear to be feldspar. Large regions of the chalcedony cement are translucent.
Copyright: © David Goza      Photo ID: 345197     Uploaded by: David Goza   View Count: 290   Approval status: Public galleries    Type: Photo - 1350 x 1155 pixels (1.6 Mpix)

HYD-UYNChert

Multiple photos available
Caddo Co., Oklahoma, USA

Chert from an Oklahoma Highway 19 road cut a few miles west of Apache, 5 cm x 4.5 cm x 2.75 cm.

This subtly-colored, highly translucent chert contains oolitic structures and features freshly-broken faces on all sides. Chert like this is found in small lenses in the Ordovician-Period limestone of the Slick Hills, the northwestern-most portion of the Arbuckle Fold Belt.
Copyright: © David Goza      Photo ID: 344936     Uploaded by: David Goza   View Count: 607   Approval status: Public galleries    Type: Photo - 2514 x 2009 pixels (5.1 Mpix)

7AK-2JNChalcedony (Var: Agate)

Multiple photos available
Seminole Co., Oklahoma, USA

"Boley agate" from Seminole County, Oklahoma. 7.3 cm x 5.5 cm x 4 cm. Tumble-polished.

This is one of the more colorful Boley agates in my collection (for more details, see my Mindat home page). When I found it, it was covered with a generous coating of bitumen from the seepages that can be found all over the deeper depositional areas of Oklahoma. One of the surfaces appears to be a large weathered feldspar clast.

This piece now resides in the collection of Jim Goza.
Copyright: © David Goza      Photo ID: 344711     Uploaded by: David Goza   View Count: 2012   Approval status: Public galleries    Type: Photo - 2431 x 1759 pixels (4.3 Mpix)

YL7-KYDChert

Multiple photos available
Carroll Co., Arkansas, USA

Chert, collected from a road cut on U.S. Highway 62 about a mile west of Eureka Springs. 19.5 cm x 12.5 cm x 11 cm. This large chert nodule is freshly-broken on most faces, revealing the rough concentric banding of most such chert from the area. The conchoidal fractures that made this material valuable for tool-making are in evidence on many of the broken surfaces.

This specimen comes from the Penters Chert, a Devonian-Period formation that is exposed in numerous deep valley walls in the Ozark Plateau across northern Arkansas and into southern Missouri. For details, see the excellent geologic map of Arkansas published by the Arkansas Geological Survey ( http://www.geology.ar.gov/sms_maps/Geologic%20Map%20of%20Arkansas%201993%20%2834x52%29.pdf ) and correlate the information with a Google Earth search of Eureka Springs; locate the new road cut (then under construction) near Lake Leatherwood, just west of Eureka Springs.
Copyright: © David Goza      Photo ID: 343142     Uploaded by: David Goza   View Count: 1972   Approval status: Public galleries    Type: Photo - 3223 x 2300 pixels (7.4 Mpix)

TT3-72VChalcedony (Var: Agate)

Multiple photos available
Seminole Co., Oklahoma, USA

Chalcedony, var. agate, found near Sasakwa, OK, 10/16/10. 3.6 cm x 3.5 cm x 2.4 cm. This agate is unusual in that it doesn't fit the standard description of Boley agates, "chert breccia." This specimen instead represents a cavity fill, with an axis of accumulation clearly discernible from end to end. This is one end-on view.

As a matter of purely personal interest: I collected this agate about four hours before photographing it and uploading it to the Mindat page. I found it about ten minutes after seeing, for the first time in my life, a diamondback rattlesnake. It was kind enough to alert me to its presence. It was loosely coiled - a configuration that it no doubt assumed upon my approach. It was a magnificent animal, but not wishing to spend a few days in a hospital drifting in and out of a coma, I gave it a wide, respectful berth.
Photo ID: 341030     Uploaded by: David Goza   View Count: 458   Approval status: Public galleries    Type: Photo - 2155 x 1523 pixels (3.3 Mpix)

9KP-VQCChalcedony (Var: Agate)

Multiple photos available
Seminole Co., Oklahoma, USA

Chalcedony, var. agate. 9 cm x 7 cm x 4.5 cm. This material is known locally as "Boley agate," after a small town in neighboring Okfuskee County. It is usually characterized as a chert breccia, although many of the clasts in typical specimens appear to be some kind of feldspar.

This specimen is unusual in that all the chert clasts are white, and the cement is mostly white as well.
Photo ID: 340790     Uploaded by: David Goza   View Count: 516   Approval status: Public galleries    Type: Photo - 3509 x 2555 pixels (9.0 Mpix)
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