Ronald John Gyllenhammer's Photo Gallery
H1W-66UArfvedsonite [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Dimensions: 11.5 cm x 4 cm x 3.5 cm
Specimen size is 11.5 x 4.0 x 3.5cm It's a remarkable specimen that was field collected by Peter Samuelson, then went to Ernie Schlichter and I obtained it from him. It is likely among the largest US specimens of Arfvedsonite, at least that I know of. This specimen was photographed by and is in the collection of Ron Gyllenhammer.
Q6F-XV6Arfvedsonite [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2 , Albite Na(AlSi3O8)
Dimensions: 5.5 cm x 4.5 cm x 3.5 cm
Specimen size is 5.5 x 4.5 x 3.5 cm and FOV is 2.0 cm. Specimen was collected sometime in the 1980's by Kenneth Canning, Sr. This specimen was photographed by and is in the collection of Ron Gyllenhammer.
GDE-2XDArfvedsonite [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2 , Microcline K(AlSi3O8)
Dimensions: 5 cm x 4.8 cm x 3.7 cm
Specimen size is 5.0 x 4.8 x 3.7 cm and FOV is 2.0 cm. Specimen was collected sometime in the 1980's by Kenneth Canning, Sr. This specimen was photographed by and is in the collection of Ron Gyllenhammer.
FN5-0H2Andradite-Grossular Series
Dimensions: 7 cm x 6 cm x 4 cm
Specimen size is 7.0 x 6.0 x 4.0cm, FOV is 1.6cm. Largest crystal is approx. 1.0 x 1.0 x 1.00cm. Garnets from this location are typically lustrous, display complex striated faces and are usually quite euhedral. This specimen was photographed by and is in the collection of Ron Gyllenhammer.
HLQ-PK5Quartz (Var: Amethyst) SiO2
Dimensions: 8 cm x 5.5 cm x 4 cm
Specimen size is 8.0 x 5.5 x 4.0 cm. Largest sceptre crystal is 4.0 x 2.0 x 1.5 cm. The specimen represents a secondary growth of clear to Amethyst colored Quartz over the original Smoky Quartz crystals. It is JB STONE labeled as coming from Hurricane Mt. New Hampshire. Acquired @ ECGMF Show 2010 from Smith Minerals, out of the Roy A. Smith Collection. This specimen was photographed by and is in the collection of Ron Gyllenhammer.
QRA-G7HAlmandine Fe2+3Al2(SiO4)3
Dimensions: 6 cm x 4.5 cm x 4 cm
Specimen size is 6.0 x 4.5 x 4.0 cm. This Almandine Garnet crystal is 4.0 x 3.5 x 3.0 cm. The Garnet crystal shows a naturally rehealed fracture, probably due to post crystallization tectonics. It is JB STONE labeled as coming from Bowdoinham, Maine. Acquired @ ECGMF Show 2010 from Smith Minerals, out of the Roy A. Smith Collction. This specimen was photographed by and is in the collection of Ron Gyllenhammer.
0GX-FM9Epidote (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Dimensions: 2.5 cm x 1.5 cm x 1 cm
Specimen size is 2.5 x 1.5 x 1.0 cm. This thumbnail Epidote thumbnail is labeled as coming from Bel'Al'ma, within the Rangkul' Pegmatite Field. Acquired @ ECGMF Show 2010 from A. Petrov. This specimen was photographed by and is in the collection of Ron Gyllenhammer.
M6K-H4AMontebrasite LiAl(PO4)(OH)
Dimensions: 2.3 cm x 0.7 cm x 0.18 cm
Specimen size is 2.3 x 0.7 x 0.18 cm. Doubly terminated example of Montebrasite from Mendes Pimental, ex. E. Schlichter. This specimen was photographed by and is in the collection of Ron Gyllenhammer as TN00204.
* The specimen came to me labeled as "Amblygonite". In the 2006 study by Rondeau B, Fritsch E, Lefevre P, Guiraud M, Fransolet A M, Lulzac Y (2006) A Raman investigation of the amblygonite—montebrasite series, The Canadian Mineralogist, 44, 1109-1117, it is proposed by the authors that most if not all the Brazilian, gem material "Amblygonite" is really the (OH) dominant species in the series, Montebrasite. They further cite London, et al (2001)as he showed geochemical evidence of early fluorine depletion supporting their study.
HT6-GT5Prehnite Ca2Al2Si3O10(OH)2
Dimensions: 6 cm x 4.5 cm x 2.5 cm
This prehnite specimen is from a under represented locality, the Tamarack Mine. Under the microscope you can see small bits of native copper. There is a also a preferential direction, secondary growth of calcite on the specimen. The specimen is labeled on the back side, "Prehnite, Tamarack Mine, Lake Superior", probably turn of the century. This specimen was photographed by Ron Gyllenhammer.
Labeled, "Prehnite Tamarack Mine Lake Superior"
Label size is 3.0 x 2.4 cm. This is the back side of a prehnite specimen labeled, "Prehnite, Tamarack Mine, Lake Superior". This specimen was photographed by Ron Gyllenhammer.
