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  2. Labradorite - Wikipedia

    en.wikipedia.org/wiki/Labradorite

    Labradorite ((Ca, Na)(Al, Si) 4 O 8) is a calcium-enriched feldspar mineral first identified in Labrador, Canada, which can display an iridescent effect . Labradorite is an intermediate to calcic member of the plagioclase series.

  3. Spectrolite - Wikipedia

    en.wikipedia.org/wiki/Spectrolite

    Finnish geologist Aarne Laitakari (1890–1975) described the peculiar stone and sought its origin for years when his son Pekka discovered a deposit at Ylämaa in south-eastern Finland, while building the Salpa Line fortifications there in 1940. The quarrying of spectrolite began after the Second World War and became a significant local ...

  4. Chatoyancy - Wikipedia

    en.wikipedia.org/wiki/Chatoyancy

    aquamarine varieties), charoite, tourmaline, labradorite, selenite, feldspar, apatite, moonstone, thomsonite and scapolite amongst others. Chatoyancy is not limited to gemstones but can also be found in various wood species and carbon fiber. Synthetically made gemstones with optical fibers can also have chatoyancy. These gemstones are available ...

  5. Sunstone - Wikipedia

    en.wikipedia.org/wiki/Sunstone

    In the early 2000s, a new variety of red or green gemstone resembling sunstone and known as "Andesine" appeared in the gem market. After much controversy and debate, most of these gemstones, allegedly sourced from China, were subsequently discovered to have been artificially colored by a copper diffusion process. [ 2 ]

  6. Feldspar - Wikipedia

    en.wikipedia.org/wiki/Feldspar

    Feldspar (/ ˈ f ɛ l (d) ˌ s p ɑːr / FEL(D)-spar; sometimes spelled felspar) is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. [3]

  7. Plagioclase - Wikipedia

    en.wikipedia.org/wiki/Plagioclase

    Labradorite frequently shows an iridescent display of colors due to light refracting within the lamellae of the crystal. [29] It is named after Labrador, where it is a constituent of the intrusive igneous rock anorthosite which is composed almost entirely of plagioclase. [28] A variety of labradorite known as spectrolite is found in Finland ...

  8. Bytownite - Wikipedia

    en.wikipedia.org/wiki/Bytownite

    Bytownite is a calcium rich member of the plagioclase solid solution series of feldspar minerals with composition between anorthite and labradorite.It is usually defined as having between 70 and 90%An (formula: (Ca 0.7−0.9 Na 0.3−0.1)[Al(Al,Si)Si 2 O 8]).

  9. Agate - Wikipedia

    en.wikipedia.org/wiki/Agate

    The stone is typically colored red and white but is also seen to exhibit yellow and grey combinations as well. [19] Crazy lace agate is a vein agate that formed in sedimentary rock of the late Cretaceous period.

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