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2. Preciosa (corporation) - Wikipedia

   en.wikipedia.org/wiki/Preciosa_(corporation)

   During the Cold War, Preciosa closely collaborated with the Communist regime.From the 1960s to the 1980s, Preciosa was an integral part of Věznice Minkovice [], a labor camp set up by the Communist government in 1958, now known as one of the most brutal Communist prison camps in Czechoslovakia; it was even nicknamed "The Red Hell" or "Minkau" (after the Nazi concentration camp in Dachau) by ...

3. Prices of chemical elements - Wikipedia

   en.wikipedia.org/wiki/Prices_of_chemical_elements

   This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison.

4. Lead glass - Wikipedia

   en.wikipedia.org/wiki/Lead_glass

   Cut glass wine glass made of lead glass. Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. [1] Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. [2]

5. Crystal Springs hot springs - Wikipedia

   en.wikipedia.org/wiki/Crystal_Springs_hot_springs

   There is a large soaking pool fed by the spring water. GPS coordinates are N 37 31.920 W 115 13.980 [3] The nearly ghost town of Crystal Springs is located at the Nevada Historical Marker 205 (Crystal Springs), in the Pahranagat Valley region of Lincoln County, Nevada. [4]

6. Prasiolite - Wikipedia

   en.wikipedia.org/wiki/Prasiolite

   Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz.. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [citation needed] but it has also been mined in the Lower Silesia region of Poland.