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2. Hematite - Wikipedia

   en.wikipedia.org/wiki/Hematite

   Hematite (/ ˈ h iː m ə ˌ t aɪ t, ˈ h ɛ m ə-/), also spelled as haematite, is a common iron oxide compound with the formula, Fe 2 O 3 and is widely found in rocks and soils. [6] Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe 2 O 3. It has the same crystal structure as corundum ...

3. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Eilat stone; Epidosite; Glimmerite; Goldstone (glittering glass) Hawk's eye; Helenite (artificial glass made from volcanic ash) Iddingsite; Kimberlite; Lamproite; Lapis lazuli; Libyan desert glass; Llanite; Maw sit sit; Moldavite; Obsidian; Apache tears; Pallasite; Peridotite (also known as olivinite) Siilinjärvi carbonatite; Soapstone (also ...

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

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

   A 2010 effort led by State Senator Gloria J. Romero, a Democrat from Los Angeles, sought to remove serpentine from its perch as the state's official stone. Organizations such as the Asbestos Disease Awareness Organization have supported the move as the olive green rock is a source of chrysotile , a form of asbestos that can cause mesothelioma ...

5. Heliotrope (mineral) - Wikipedia

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

   The Gnostics wore the stone as an amulet for longevity, for wealth and courage, to strengthen the stomach, and to dispel melancholy. [6] In the Middle Ages it was considered useful for animal husbandry. [6] The ancient Greeks and Romans wore the stone to bring renown and favor, to bring endurance, and as a charm against the bite of venomous ...

6. 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 ...

7. Aqeeq - Wikipedia

   en.wikipedia.org/wiki/Aqeeq

   A geode of chalcedony richly colored by hematite that gives it its rusty hues and marks it as Akik [contradictory] Aqeeq, akik or aqiq (Arabic: العقيق) means quartz in Arabic, and agate in Turkish, however in the context of rings usually refers to a ring set with a chalcedony stone. Well-known types of chalcedony are carnelian, agate, and ...