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  2. Concretion - Wikipedia

    en.wikipedia.org/wiki/Concretion

    Moqui Marbles, hematite, goethite concretions, from the Navajo Sandstone of southeast Utah. The "W" cube at the top is one cubic centimeter in size. Moqui Marbles , also called Moqui balls or "Moki marbles", are iron oxide concretions which can be found eroding in great abundance out of outcrops of the Navajo Sandstone within south-central and ...

  3. 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 ...

  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. A monster diamond, ancient lipstick and erotic Roman ... - AOL

    www.aol.com/news/monster-diamond-ancient...

    The stone vessel containing a deep red mixture of minerals — primarily hematite, along with manganite, braunite and vegetable-based waxy ingredients — is “probably the earliest” example of ...

  6. Aetites - Wikipedia

    en.wikipedia.org/wiki/Aetites

    Eagle stone amulet, seventeenth century, from the Bavarian and Austrian amulet collection of W. L. Hildburgh, originally gifted to the Wellcome Museum. In the magical tradition of Europe and the Near East (see: Magic in the Greco-Roman world ), the aetites (singular in Latin ) or aetite ( anglicized ) is a stone used to promote childbirth .

  7. Taconite - Wikipedia

    en.wikipedia.org/wiki/Taconite

    The iron content of taconite is generally 30% to 35%, and the silica content generally around 45%. Iron in taconite is commonly present as magnetite, iron silicates, and iron-bearing carbonates, and locally martite (hematite) formed by oxidation of magnetite.

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