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Crystals show pleochroism from red to blue to violet. Dumortierite quartz is blue colored quartz containing abundant dumortierite inclusions. Dumortierite was first described in 1881 for an occurrence in Chaponost , in the Rhône - Alps of France and named for the French paleontologist Eugène Dumortier (1803–1873). [ 5 ]
Castle Mountain (Blackfoot: Miistukskoowa) is a mountain located within Banff National Park in the Canadian Rockies, approximately halfway between Banff and Lake Louise.It is the easternmost mountain of the Main Ranges in the Bow Valley and sits astride the Castle Mountain Fault which has thrust older sedimentary and metamorphic rocks forming the upper part of the mountain over the younger ...
Quartzite is a very hard rock composed predominantly of an interlocking mosaic of quartz crystals. The grainy, sandpaper-like surface is glassy in appearance. Minor amounts of former cementing materials, iron oxide, silica, carbonate and clay, often migrate during recrystallization, causing streaks and lenses to form within the quartzite. [ 1 ]
Blue Mounds State Park was the scene of a murder May 20, 2001, when Carrie Nelson, then 20, was beaten to death while working alone in the park office. A coroner said the wounds to her head appeared as if she'd been struck with a rock. The killer apparently stole about $2,000 from the park coffers.
Van Hise Rock is a rock monolith located along Wisconsin Highway 136 near Rock Springs, Wisconsin.The rock is a geologically significant outcropping of Baraboo Quartzite.. It serves as a monument to Charles Van Hise, a prominent Wisconsin geologist who studied the area extensively. [3]
Llanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangeish). The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals.
Chalcedony's standard chemical structure (based on the chemical structure of quartz) is SiO 2 (silicon dioxide). Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black.
The most common color of aventurine is green, but it can also be orange, brown, yellow, blue, or grey. Chrome-bearing fuchsite (a variety of muscovite mica) is the classic inclusion and gives a silvery green or blue sheen. Oranges and browns are attributed to hematite or goethite.