• Ilmenite - Wikipedia

    Ilmenite, also known as Manaccanite, is a titanium-iron oxide mineral with the idealized formula FeTiO 3.It is a weakly magnetic black or steel-gray solid. From a commercial perspective, ilmenite is the most important ore of titanium.

  • Gemstone Type List: Guide to Precious & Semi-Precious Color ...

    List of precious & semi-precious gemstones: With over 130 gem varieties, our gemstone index will help you find the perfect colored stone for your jewelry & crystal healing needs - GemSelect

  • Earth could become a Waterworld, but it ... - Daily Mail Online

    They found that in rocks from the Andes and Central America – where continental crust is still forming – ratios of silicon to the isotopes related to the thickness of the crust the rocks had come from.

  • Peridot: Buy Loose Peridot Gemstones for Jewelry ... - GemSelect

    Buy natural peridot gemstones for jewelry from GemSelect, loose green peridot gemstones. Buy fine natural loose peridot gems at wholesale prices for custom jewelry

  • Types of Rocks: The Three Major Rock Groups - Study.com

    Did you know that lava is molten rock that reaches the earth's surface? Furthermore, did you know that rocks exist in three general forms: igneous, sedimentary and metamorphic?

  • Rock Cycle: Igneous, Sedimentary, and Metamorphic Rocks ...

    In this lesson, we will discuss the three main types of rocks and how they are formed. The lesson also gives an introduction into how matter locked...

  • List of rock types - Wikipedia

    The following is a list of rock types recognized by petrologists.There is no agreed number of specific types of rocks. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe rock types.

  • Gemstone Terminology - Earth Mother Crafts

    Terminology *Information regarding gemstone lore and metaphysical properties has been compiled from various sources and is for entertainment purposes only.

  • World Maps: Political, Physical, Satellite, Africa, Asia, Europe

    A collection of world maps, country maps, state maps, continent maps, satellite images and much more.