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  2. Rutilated quartz - Wikipedia

    en.wikipedia.org/wiki/Rutilated_quartz

    Rutilated quartz used as a gemstone. Rutilated quartz is a variety of quartz which contains acicular (needle-like) inclusions of rutile. [1] It is used for gemstones. These inclusions mostly look golden, but they also can appear silver, copper red or black.

  3. Dumortierite - Wikipedia

    en.wikipedia.org/wiki/Dumortierite

    Dumortierite quartz is blue colored quartz containing abundant dumortierite inclusions. Dumortierite was first described in 1881 for an occurrence in Chaponost, in the Rhône-Alps of France and named for the French paleontologist Eugène Dumortier (1803–1873). [5]

  4. Rutile - Wikipedia

    en.wikipedia.org/wiki/Rutile

    Rutile in quartz. Within the igneous environment, rutile is a common accessory mineral in plutonic igneous rocks, though it is also found occasionally in extrusive igneous rocks, particularly those such as kimberlites and lamproites that have deep mantle sources.

  5. Crystal healing - Wikipedia

    en.wikipedia.org/wiki/Crystal_healing

    An example of this is rose quartz. In Egypt, it was believed rose quartz could prevent aging, but the Romans used rose quartz as a seal to signify ownership, while in the Middle Ages it was used in healing potions, today rose quartz is known as the "love stone" and is used to balance emotions, and heal anger and disappointment. [17]

  6. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...

  7. Acicular (crystal habit) - Wikipedia

    en.wikipedia.org/wiki/Acicular_(crystal_habit)

    Needle-shaped acicular millerite crystals on white quartz The term "acicular" derives from the Late Latin "acicula" meaning "little needle". [ 1 ] Strictly speaking, the word refers to a growth habit that is slender and tapering to a point.