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2. Visual arts of the Indigenous peoples of the Americas

   en.wikipedia.org/wiki/Visual_arts_of_the...

   Indigenous American visual arts include portable arts, such as painting, basketry, textiles, or photography, as well as monumental works, such as architecture, land art, public sculpture, or murals. Some Indigenous art forms coincide with Western art forms; however, some, such as porcupine quillwork or birchbark biting are unique to the Americas.

3. Eclogite - Wikipedia

   en.wikipedia.org/wiki/Eclogite

   A 23 millimetres (0.91 in) coin added for scale. Eclogite ( / ˈɛklədʒaɪt /) is a metamorphic rock containing garnet (almandine - pyrope) hosted in a matrix of sodium -rich pyroxene (omphacite). Accessory minerals include kyanite, rutile, quartz, lawsonite, coesite, amphibole, phengite, paragonite, zoisite, dolomite, corundum and, rarely ...

4. Quartzite - Wikipedia

   en.wikipedia.org/wiki/Quartzite

   Quartzite. Quartzite is a hard, non- foliated metamorphic rock which was originally pure quartz sandstone. [1][2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts. Pure quartzite is usually white to grey, though quartzites often occur in various shades of pink and ...

5. Baraboo Quartzite - Wikipedia

   en.wikipedia.org/wiki/Baraboo_Quartzite

   Baraboo Quartzite is a Precambrian geological formation [ 1 ] of quartzite, found in the region of Baraboo, Wisconsin. While pure quartzite is usually white or gray, Baraboo Quartzite is typically dark purple to maroon in color, due to the presence of iron (hematite) and other impurities. [ 2 ] Baraboo Quartzite may display strata created by ...

6. Glacier Bay National Park and Preserve - Wikipedia

   en.wikipedia.org/wiki/Glacier_Bay_National_Park...

   A molybdenite deposit occurs on The Nunatak in quartz veins associated with a quartz monzonite porphyry, [9] [10] which includes gold at 0.04 ounces per ton, and silver at 7.07 ounces per ton. A copper deposit occurs on Observation Mountain. Quartz veins containing gold are exposed west of Dundas Bay and on Gilbert Island. Placer gold is also ...

7. Flint - Wikipedia

   en.wikipedia.org/wiki/Flint

   Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [1][2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones ...