Alfredo Petrov's Photo Gallery
MQ0-JPDGypsum CaSO4·2H2O
Dimensions: 10.5 cm
Aggregate of pale beige colored gypsum crystals from Chula Vista.
Bob Reynolds collection, 10.5cm.
TVW-8VFCalcite CaCO3
Dimensions: 16 cm
Jewel Tunnel (JTI) specimen, 16cm, probably collected in the 1980s by Dr Peter Megaw.
XFN-MP4Adachiite CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)
Field of View: 8 cm
Approx 8cm rock with one face partially covered by Adachiit, from the type locality. Photo taken through the glass of a display case at the Fossa Magna Museum.
F86-R2UChalcedony (Var: Blue Chalcedony) SiO2
Dimensions: 15 cm
Rock Currier specimen, found 25 km from Ngabu, which shows that the "Ngabu" blue chalcedonies are found over a wide area and are obviously not all from the immediate vicinity of the village. 15 cm long.
Roca Pastora quarry
Roca Pastora quarry, taken from roughly 3 km distance. The snow-covered summits in the distance are the Pyrenees.
KA4-MATSphalerite ZnS
Dimensions: 28 mm
Field of View: 35 mm
Largest Crystal Size: 28 mm
2.8 cm complex twinned sphalerite crystal from the Ani mine (probably Sayama section), partially internally transparent (See daughter photo).
Hans Block Sr
5PD-79EQuartz SiO2
Largest Crystal Size: 8 cm
8cm amethystine quartz crystal with a rough pinacoid "c-face", which are fairly typical of crystals from this mining district.
66H-CRUManganese Oxides (Var: Manganese Dendrites)
Field of View: 8 mm
Manganese dendrites (species unknown, but cryptomelane would be likely) on microcline from Mt Malosa.
8 mm fov
V26-F12Kannanite Ca4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 , Hematite Fe2O3 , Quartz SiO2
Field of View: 6 mm
Two very thin parallel veinlets of brownish yellow kannanite (running vertically in the photo), along with thicker veins of (overexposed) white quartz, cutting a matrix of fine-grained massive hematite. Field of view 6 mm. (Braunite and piemontite are also present elsewhere in this specimen, but not visible in the photo.)
