Karl Volkman's Photo Gallery
D54-XRFPerovskite CaTiO3 , Kimzeyite Ca3Zr2(SiO4)(AlO4)2
Magnet Cove, Hot Spring County, Arkansas, USAA 1mm perovskite with associated kimzeyite in matrix. Photographed by, and in the collection of, Don Volkman
72Y-YWCPyrite FeS2 , Baryte BaSO4
Frostburg, Allegany County, Maryland, USAA mass of tarnished and slightly iridescent pyrites with white baryte on matrix. Field of view 2mm Photographed by, and in the collection of Don Volkman.
VXN-24KGold (Var: Electrum) (Au,Ag)
Butte Mining District, Silver Bow County, Montana, USAA small sheet of "electrum" (visually identified) collected during the summer of 2002 at one of the outer Silver/manganese halo mines of the Butte District. The sheet is 2mm by 2mm.
Photographed by, and in the collection of, Don Volkman. BB
PVH-38GMagnetite Fe2+Fe3+2O4
Nordmark mining district, Filipstad, Värmland County, SwedenA group of magnetite crystals on matrix, the largest crystal is 3mm across the large face.
Photographed by, and in the collection of, Don Volkman
PLU-V1JSphalerite ZnS , Quartz SiO2
Butte Mining District, Silver Bow County, Montana, USAA complex sphalerite crystal mass approximately .75mm across collected by Don Volkman from a mine in the outer silver/manganese belt of the Butte District, Montana.
Photographed, collected, and in the collection of Don Volkman
6T3-39RGoethite α-Fe3+O(OH) , Quartz SiO2
Estacion Ojo Laguna, Ahumada Municipality, Chihuahua, MexicoA spray of goethite needles 1.5mm tall emerging from a quartz crystal cluster
Photographed by Karl Volkman. Cut and in the collection of Don Volkman.
Combined from 15 frames using Combine ZP
GF1-F0JGoethite α-Fe3+O(OH) , Quartz SiO2
Estacion Ojo Laguna, Ahumada Municipality, Chihuahua, MexicoA small mass of goethite sporting a pair of long needles reaching just over 2mm long.
Photographed by Karl Volkman. Cut and in the collection of Don Volkman.
Combined from 10 frames using Combine ZP
R2Y-RPAGoethite α-Fe3+O(OH) , Quartz SiO2
Estacion Ojo Laguna, Ahumada Municipality, Chihuahua, MexicoA 1mm tall mass of goethite needles partially enclosed in a group of quartz crystals.
Photographed by Karl Volkman. Cut and in the collection of Don Volkman.
Combined from 10 frames using Combine ZP
A9A-DPTGoethite α-Fe3+O(OH) , Quartz SiO2
Estacion Ojo Laguna, Ahumada Municipality, Chihuahua, Mexicoroot beer brown Crystals of Goethite on quartz. This is the largest grouping of the blades in this agate/geode. Field of View 2mm
Photographed by Karl Volkman. Cut and in the collection of Don Volkman
Combined from 6 Frames using Combine ZP.
4YC-7L6Goethite α-Fe3+O(OH) , Quartz SiO2
Oco geode deposits, Três Pinheiros, Fontoura Xavier, Rio Grande do Sul, BrazilA small mass, ~3mm tall, of possible goethite on quartz with masses of white and clear quartz grains
Photographed by, and in the collection of, Karl Volkman.
Stack of 15 frames combined using Combine ZP