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  2. Van Hise Rock - Wikipedia

    en.wikipedia.org/wiki/Van_Hise_Rock

    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]

  3. Quartzite - Wikipedia

    en.wikipedia.org/wiki/Quartzite

    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 ]

  4. Aventurine - Wikipedia

    en.wikipedia.org/wiki/Aventurine

    Aventurine feldspar or sunstone can be confused with orange and red aventurine quartzite, although the former is generally of a higher transparency. Aventurine is often banded and an overabundance of fuchsite may render it opaque, in which case it may be mistaken for malachite at first glance.

  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 ]

  6. Dumortierite - Wikipedia

    en.wikipedia.org/wiki/Dumortierite

    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 ]

  7. Zuni fetishes - Wikipedia

    en.wikipedia.org/wiki/Zuni_fetishes

    The primary non-Native source for academic information on Zuni fetishes is the Second Annual Report of the Bureau of Ethnology submitted in 1881 by Frank Hamilton Cushing and posthumously published as Zuni Fetishes in 1966, with several later reprints.

  8. Hardstone carving - Wikipedia

    en.wikipedia.org/wiki/Hardstone_carving

    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. [1] [2] Normally the objects are small, and the category overlaps with both jewellery and ...

  9. List of piezoelectric materials - Wikipedia

    en.wikipedia.org/wiki/List_of_piezoelectric...

    The following table lists the following properties for piezoelectric materials The piezoelectric coefficients (d 33, d 31, d 15 etc.) measure the strain induced by an applied voltage (expressed as meters per volt).

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