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2. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

3. Rare-earth mineral - Wikipedia

   en.wikipedia.org/wiki/Rare-earth_mineral

   These minerals contain the 16 rare earth elements which are also known as the lanthanides. [7] [7] The presence of these minerals can be a valuable indicator in geological surveys and mineral resource assessments. [8] [8] There are over 160 rare earth minerals known, but only four of these occur in amounts suitable for mining. [9]

4. Mountain Pass Rare Earth Mine - Wikipedia

   en.wikipedia.org/wiki/Mountain_Pass_rare_earth_mine

   It contains 8% to 12% rare-earth oxides, mostly contained in the mineral bastnäsite. [5] Gangue minerals include calcite, barite, and dolomite. It is regarded as a world-class rare-earth mineral deposit. [3] The metals that can be extracted from it include: [6] cerium, lanthanum, neodymium, [7] and europium.

5. Lists of mines in the United States - Wikipedia

   en.wikipedia.org/wiki/Lists_of_mines_in_the...

   Mine: State: Coordinates: Associated town: Owner: Dates: Comments: Crater of Diamonds State Park: Arkansas: Murfreesboro: Arkansas: 1906–Present (Open to public for small fee) [1] Commercial mining ventures failed, only diamond mine accessible to the general public.

6. List of rock types - Wikipedia

   en.wikipedia.org/wiki/List_of_rock_types

   Litchfieldite – A metamorphosed nepheline syenite occurrence near Litchfield, Maine; Llanite – Type of mineral – A hypabyssal rhyolite with microcline and blue quartz phenocrysts from the Llano Uplift in Texas; Luxullianite – Rare type of granite; Mangerite – Plutonic intrusive igneous rock, that is essentially a hypersthene-bearing ...

7. List of minerals - Wikipedia

   en.wikipedia.org/wiki/List_of_minerals

   Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...

8. Placer deposit - Wikipedia

   en.wikipedia.org/wiki/Placer_deposit

   Placer minerals are defined as having a specific gravity above 2.58. [1] The separation of the valuable minerals from the most common non-economic mineral, quartz, depends on the difference in specific gravity / density.The weathering process allows for the accumulation of placer minerals, while less dense material such as quartz are swept away.

9. Mindat.org - Wikipedia

   en.wikipedia.org/wiki/Mindat.org

   Mindat claims to be the largest mineral database and mineralogical reference website on the Internet. [7] [2] It is crowd-sourced and also expert-reviewed and curated for data quality. The database is used by professional mineralogists, geologists, and amateur mineral collectors alike, and is referenced in many publications. [8] [9] [10]