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2. Help:Download as PDF - Wikipedia

   en.wikipedia.org/wiki/Help:Download_as_PDF

   Some web browsers allow you to simply Save As... or Print to PDF. Wikipedia's inbuilt Download as PDF option. Other PDF software can be used to create a PDF from the web page, which may give more control over the output. This page offers help with Wikipedia's download tool.

3. 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 ...

4. Trona - Wikipedia

   en.wikipedia.org/wiki/Trona

   Trona (trisodium hydrogendicarbonate dihydrate, also sodium sesquicarbonate dihydrate, Na 2 CO 3 ·NaHCO 3 ·2H 2 O) is a non-marine evaporite mineral. [4] [6] It is mined as the primary source of sodium carbonate in the United States, where it has replaced the Solvay process used in most of the rest of the world for sodium carbonate production.

5. Portal:Minerals - Wikipedia

   en.wikipedia.org/wiki/Portal:Minerals

   The concept of mineral is distinct from rock, which is any bulk solid geologic material that is relatively homogeneous at a large enough scale. A rock may consist of one type of mineral or may be an aggregate of two or more different types of minerals, spacially segregated into distinct phases.

6. List of minerals recognized by the International ...

   en.wikipedia.org/wiki/List_of_minerals...

   Mineral structures with a tetrahedral unit, framework silicates. Cyclosilicates (subclass 9.C): Phyllosilicates (subclass 9.E): Tridimensional silicate frameworks: tectosilicates (subclass 9.F) Silica family (class 4, family DA): dioxosilicate [SiO 2] Tectosilicates, zeolites (subclass 9.G): Mineral structures with a tetrahedral unit, other cases

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