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2NA-49PAlmandine Fe2+3Al2(SiO4)3 , Albite Na(AlSi3O8)
Field of View: 20 mm
Largest Crystal Size: 6 mm
Almandine crystals in white albite matrix.
49R-4V9Stilbite Subgroup M6-7[Al8-9Si27-28O72]·nH2O , Quartz SiO2
Dimensions: 11 cm x 10 cm x 5 cm
Field of View: 5 cm
Weight: 380 g
Quartz crystals from an Alpine-type cleft studded with myriad, stubby stilbite crystals. Former Fred D'Ambrose collection.
VRF-2DNChrysocolla Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O, x < 1 , Malachite Cu2(CO3)(OH)2 , Tremolite ◻Ca2Mg5(Si8O22)(OH)2 , Calcite CaCO3
Dimensions: 6.5 cm x 3 cm x 2.5 cm
Weight: 55 g
A piece of weathered calcite marble showing a horizontal layer of tremolite grains standing out in relief and surrounded by pale blue chrysocolla and green malachite from the alteration of tiny chalcopyrite grains in the marble. The marble is from the Basal Member of The Straits Schist, which crop out at the quarry, and the presence of copper as chalcopyrite grains (with colorful alteration) is similar to the same marble at the Stevenson Mine in Oxford.
P02-DGRK Feldspar (Var: Adularia) KAlSi3O8 , Quartz SiO2
Field of View: 6 cm
Adularia crystals with quartz, the latter occasionally with chlorite phantoms. Collected from an alpine cleft. Mike Polletta specimen.
UV0-KUPQuartz SiO2 , Stilbite Subgroup M6-7[Al8-9Si27-28O72]·nH2O
Dimensions: 18 cm x 13.5 cm x 6 cm
Largest Crystal Size: 5 cm
Weight: 1066 g
Plate of quartz crystals partially encrusted with a druse of white stilbite subgroup crystals, preferentially on one side. From a large Alpine cleft found in the 1980s.
49Q-KHUK Feldspar (Var: Adularia) KAlSi3O8 , Quartz SiO2
Dimensions: 10 cm x 9 cm x 4.5 cm
Field of View: 12.3 mm
Weight: 487 g
White, angular adularia crystals nestled in between quartz crystals.
D3E-DU8Brochantite Cu4(SO4)(OH)6
Field of View: 65 mm
Brochantite on schist formed by weathering copper sulfides. ID visually and via wet chemical microanalysis. Mineralized spot in foreground is 7mm wide.
6H6-X24Quartz SiO2
Field of View: 3 cm
Quartz crystals on the wall of an Alpine cleft.
8UF-ATXStilbite Subgroup M6-7[Al8-9Si27-28O72]·nH2O , Quartz SiO2
Dimensions: 6.9 cm x 6.8 cm x 3.0 cm
6.9 x 6.8 x 3.0 cm. This less well-known quarry in gneissic or schistose rocks has produced superb specimens of quartz with zeolites and adularia in alpine clefts and a wide variety of copper minerals (MINDAT). This is a very fine and deceptive combination plate. Shrub-like clusters of creamy stilbite blades totally cover one side of the piece. The other side shows the glassy quartz points the stilbites were deposited on. Choice and uncommon combination material for the locale.
09J-L4XK Feldspar (Var: Adularia) KAlSi3O8 , Quartz SiO2
Dimensions: 6.5 cm x 6 cm x 2 cm
Field of View: 4.5 cm
Weight: 59 g
Drusy, milky adularia crystals between glassy quartz crystals.