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  2. Category:Gemstone mines - Wikipedia

    en.wikipedia.org/wiki/Category:Gemstone_mines

    This category is for mines for cardinal gems other than Diamond, ie amethyst, emerald, ruby & sapphire, and also opal mines (see Gemstone). Subcategories This category has the following 3 subcategories, out of 3 total.

  3. Old School RuneScape - Wikipedia

    en.wikipedia.org/wiki/Old_School_RuneScape

    Old School RuneScape is a massively multiplayer online role-playing game (MMORPG), developed and published by Jagex.The game was released on 16 February 2013. When Old School RuneScape launched, it began as an August 2007 version of the game RuneScape, which was highly popular prior to the launch of RuneScape 3.

  4. Vein (geology) - Wikipedia

    en.wikipedia.org/wiki/Vein_(geology)

    The difference between 19th-century and 21st-century mining techniques and the type of ore sought is based on the grade of material being mined and the methods of mining which are used. Historically, hand-mining of gold ores permitted the miners to pick out the lode quartz or reef quartz, allowing the highest-grade portions of the lodes to be ...

  5. List of massively multiplayer online role-playing games

    en.wikipedia.org/wiki/List_of_massively...

    RuneScape: Active 3D Medieval fantasy Freemium, but with bulk of content pay-to-play 2001 Standalone & Steam RuneScape has been developed continuously since 2001. It is sometimes referred to as RuneScape 3 to distinguish it from Old School RuneScape, which was forked from its 2007 version in 2013. Rusty Hearts: Closed 3D Fantasy Free-to-play ...

  6. List of copper ores - Wikipedia

    en.wikipedia.org/wiki/List_of_copper_ores

    Following is a list of minerals that serve as copper ores in the copper mining process: [1] Image Name Formula % Copper when pure Chalcopyrite: CuFeS 2: 34.5 Chalcocite:

  7. Heliotrope (mineral) - Wikipedia

    en.wikipedia.org/wiki/Heliotrope_(mineral)

    A rough specimen of bloodstone. Heliotropes (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstones, or simply bloodstones) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper or sometimes as chalcedony (translucent).

  8. Placer mining - Wikipedia

    en.wikipedia.org/wiki/Placer_mining

    Placer mining (/ ˈ p l æ s ər /) [1] is the mining of stream bed deposits for minerals. [2] This may be done by open-pit mining or by various surface excavating equipment or tunneling equipment.

  9. Smoky quartz - Wikipedia

    en.wikipedia.org/wiki/Smoky_quartz

    Smoky quartz is common and was not historically important, but in recent times it has become a popular gemstone, especially for jewelry. [ 12 ] Sunglasses , in the form of flat panes of smoky quartz, were used in China in the 12th century.