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John A. Jaszczak's Photo Gallery

AYR-2XTGold : Au, Quartz : SiO2

Itogon mine, Baguio District, Benguet Province, Cordillera Administrative Region, Luzon, Philippines

Field of View: 2.9 mm

"Delicate ribbons of gold associated with crystallized quartz. The specimen was mined in 1935 on the Sesame vein, Itogan mine at Baguio on the island of Luzon. The father of a good friend of mine who lives in Ouray, Colorado was mine manager at the time and collected the high grade gold specimens which I was able to acquire. He departed just before the Japanese Imperial Army invaded the Philippines on 8 December 1941." -Tom Rosemeyer. Tom Rosemeyer specimen. John A. Jaszczak photomicrograph.
Copyright: © John A. Jaszczak      Photo ID: 885663     Uploaded by: John A. Jaszczak   View Count: 64   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

50Q-MANQuartz : SiO2, Copper : Cu, Epidote : {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH), K Feldspar (Var: Adularia) : KAlSi3O8, Clinochlore : Mg5Al(AlSi3O10)(OH)8

Caledonia Mine, Mass City, Ontonagon Co., Michigan, USA

Largest Crystal Size: 1.04 mm

Two doubly terminated quartz crystals measuring 1.04 & 0.41 mm in length containing "clouds" of micro anhedral syngenetic inclusions of native copper encapsulated in the crystals. Associated minerals are epidote, adularia, and chlorite. The specimen was collected on 25 July 1997 by Tom Rosemeyer when he discovered the "Pillar Pocket" located in a support pillar between the 900 & 950 stope on the Knowlton lode, adit level of the Caledonia mine. The pocket also contained beautiful hand specimens of copper and silver in arborescent crystal groups along with many well crystallized copper-included calcite crystal groups. The pocket was also a bonanza in micro crystal specimens. Tom Rosemeyer collection. Photomicrograph by John A. Jaszczak .
Copyright: © John A. Jaszczak      Photo ID: 883826     Uploaded by: John A. Jaszczak   View Count: 31   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

6UF-EQFCopper : Cu, Quartz : SiO2, Calcite : CaCO3

Rockland, Ontonagon Co., Michigan, USA

Largest Crystal Size: 2 mm

"A pair of 2.0 mm long quartz crystals containing clouds of tiny anhedral syngenetic inclusion of native copper that have been encapsulated into the crystal structure of the quartz by simultaneous crystallization of the two minerals. A slightly weathered calcite is in the foreground and at the base of the quartz crystals. This is part of the same specimen showing a scepter copper-included quartz crystal that was posted by Dr. John A.Jaszczak on 25 March 2018 [photo 881385]. The specimen was collected in summer 2016." -Tom Rosemeyer. Tom Rosemeyer collection; John A. Jaszczak photomicrograph.
Copyright: © John A. Jaszczak      Photo ID: 881972     Uploaded by: John A. Jaszczak   View Count: 56   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

720-LNFCopper : Cu, Quartz : SiO2, Epidote : {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Multiple photos available
Quincy Mine, Hancock, Houghton Co., Michigan, USA

Largest Crystal Size: 2.3 mm

"Another 'Tiny Treasure' from the Michigan Copper Country [Quincy mine, #6 shaft, Pewabic Lode]. On the left is a 2.3 mm long clear quartz crystal with anhedral syngenetic inclusions of copper in the termination of the crystal. Copper was still being deposited after completion of quartz mineralization that is shown by the partially copper-clad quartz crystals on the right side." -Tom Rosemeyer. The specimen was collected on the mine dump in summer 2014.Tom Rosemeyer collection, John Jaszczak photomicrograph.
Copyright: © John A. Jaszczak      Photo ID: 881851     Uploaded by: John A. Jaszczak   View Count: 49   Approval status: Public galleries    Type: Photo - 5112 x 3456 pixels (17.7 Mpix)

6UF-EQFCopper : Cu, Quartz : SiO2

Rockland, Ontonagon Co., Michigan, USA

Largest Crystal Size: 1.1 mm

"A 1.1 mm long quartz crystal with syngenetic inclusions of anhedral to euhedral crystals of native copper encapsulated in both the stem and crown of the clear scepter quartz crystal. In the Michigan Copper Country scepter quartz crystals are rare and with inclusions of native copper they are as rare as the proverbial "hens teeth." In my 60 years of collecting micro crystals from the Copper Country I have to say this is the most outstanding specimen in my collection dating from 1958. This specimen was collected in summer 2016." -Tom Rosemeyer (Tom Rosemeyer collection; John Jaszczak photomicrograph)
Copyright: © John A. Jaszczak      Photo ID: 881385     Uploaded by: John A. Jaszczak   View Count: 151   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

2VY-7YEScapolite

Morogoro Region, Tanzania

Dimensions: 1.7 cm x 1.3 cm x 2.1 cm

Prismatic, chatoyant, yellow-orange scapolite-group crystal with orange-red sectors. Raman spectroscopy (633 nm laser) suggests marialite, but this specimen's chemistry has not yet been analyzed.
Copyright: © John A. Jaszczak      Photo ID: 858772     Uploaded by: John A. Jaszczak   View Count: 41   Approval status: Public galleries    Type: Photo - 960 x 720 pixels (0.7 Mpix)

9QA-WAYQuartz : SiO2, Copper : Cu

Laurium Mine, Laurium, Houghton Co., Michigan, USA

Largest Crystal Size: 0.9 mm

Quartz crystal partly enclosed in copper in a vug in epidotized basalt. Collected by Tom Rosemeyer.
Copyright: © John A. Jaszczak      Photo ID: 858021     Uploaded by: John A. Jaszczak   View Count: 41   Approval status: Public galleries    Type: Photo - 2908 x 1939 pixels (5.6 Mpix)

X09-4KJErniggliite : Tl2SnAs2S6, Dolomite : CaMg(CO3)2

Lengenbach Quarry, Fäld, Binn Valley, Wallis, Switzerland

Dimensions: 0.10 mm x 0.07 mm

An extremely small but well-formed erniggliite crystal on dolomite. Also associated but not shown here are jentschite, hatchite, rutile, trechmannite, and realgar. EDS analysis by P. Roth.
Copyright: © John A. Jaszczak      Photo ID: 856328     Uploaded by: John A. Jaszczak   View Count: 72   Approval status: Public galleries    Type: Photo - 1788 x 1192 pixels (2.1 Mpix)

X09-4KJJentschite : TlPbAs2SbS6, Dolomite : CaMg(CO3)2

Lengenbach Quarry, Fäld, Binn Valley, Wallis, Switzerland

Field of View: 1.07 mm

Dark red bladed crystals of jentschite associated with dolomite, and also not shown are ernigglite, rutile, trechmannite, hutchinsonite, and tennantite. Note the oblique termination relative to the long axis. Formerly in the collection of P. Roth who verified species with EDS.
Copyright: © John A. Jaszczak      Photo ID: 856046     Uploaded by: John A. Jaszczak   View Count: 80   Approval status: Public galleries    Type: Photo - 3872 x 2581 pixels (10.0 Mpix)

L1F-2C5Fluorapatite : Ca5(PO4)3F, Diopside : CaMgSi2O6, Grossular (Var: Tsavorite) : Ca3Al2(SiO4)3, Graphite : C, Pyrite : FeS2

Multiple photos available
Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania

Largest Crystal Size: 3.7 mm

Steeply terminated blue fluorapatite crystal associated with almost colorless diopside, pale green tsavorite, and tabular graphite crystals. These are perched on a large (15 cm) sample of graphite that is also associate with white calcite crystals. The calcite and tsavorite crystals fluoresce pink and orange, respectively, in longwave UV light.
Copyright: © John A. Jaszczak      Photo ID: 851710     Uploaded by: John A. Jaszczak   View Count: 58   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)
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