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When cut and polished, Morton gneiss shows bands and swirls of black, pink, and gray, with white flecks that sometimes look like galaxies and nebulae floating in space. The rock's colors come from quartz (white), potassium feldspar (pink), plagioclase feldspar (light gray), and biotite and amphibole (black.) [2]
Augen gneiss, from the German: Augen, meaning "eyes", is a gneiss resulting from metamorphism of granite, which contains characteristic elliptic or lenticular shear-bound grains (porphyroclasts), normally feldspar, surrounded by finer grained material. The finer grained material deforms around the more resistant feldspar grains to produce this ...
Granite is a hard stone and requires skill to carve by hand. Until the early 18th century, in the Western world, granite could be carved only by hand tools with generally poor results. A key breakthrough was the invention of steam-powered cutting and dressing tools by Alexander MacDonald of Aberdeen , inspired by seeing ancient Egyptian granite ...
Quartz porphyry from the island of Alnö, Sweden. Phenocrysts of clear glassy rounded quartz and white orthoclase feldspar are set in a fine-grained matrix. Sample is just over 10 cm long. Quartz-porphyry, in layman's terms, is a type of volcanic rock containing large porphyritic crystals of quartz.
The granite is mined at the E. L. Smith Quarry, the world's largest "deep hole" granite quarry, owned by the Rock of Ages Corporation. All of the stones in the Hope Cemetery in neighboring city of Barre are made with Barre granite. [3] "Barre Gray" granite is sought after worldwide for its fine grain, even texture, and superior weather resistance.
Verd antique is very similar in colour to the national gemstone of Ireland, Connemara marble.Connemara marble differs from the verd antiques in that it is an actual marble, rather than a serpentinite breccia, despite also having a very high serpentine content.
The Woodbury Granite Company (WGC) was a producer of rough and finished granite products. Incorporated in 1887, purchased and significantly reorganized in 1896, and expanded by merger in 1902 and thereafter, the company operated quarries principally in Woodbury, Vermont, but its headquarters and stone-finishing facilities were located in nearby Hardwick.
Mughal dagger hilt in jade with gold, rubies, and emeralds.. Hardstone carving, in art history and archaeology, is the artistic carving of semi-precious stones (and sometimes gemstones), such as jade, rock crystal (clear quartz), agate, onyx, jasper, serpentinite, or carnelian, and for objects made in this way.