Results 81 to 90 of about 354 (163)
CrystalsThe trapiche garnet, a gemstone of unparalleled beauty, boasts a rare structure comprising one core, six radiating arms, and a main body. The occurrence of garnet within the trapiche structure elevates it beyond the species, granting it significant ...
Yingzhao Wang +3 more
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Yankuang ceshi, 2018 The Ningxia Helan Stone is one of the well-known stones that are used for making inkslab in China. The development and application of Helan Stone is becoming more and more widespread, and therefore, it is necessary to carry out a systematic study.
MENG Chang-feng, XUE Jun-hui
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Arabian Journal of Geosciences, 2018 There are chalcedony and amethyst formations in two fields in Aydincik-Yozgat (West of Aydincik District, Keslik area and Southwestern of Haciilyas). The gemstones in this region have been formed within the gaps and cracks of the brecciated rocks of the fault zone in altered andesites.
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Gemological characteristics and the quality of sapphire from Krong H’Nang - Dak Lak
Science and Technology Development Journal - Natural Sciences, 2018 Sapphires in Krong H'Nang area have been found mainly in deluvialor alluvial placers which related to Pliocene-lower Pleistocene basaltoid formations (βN2-Q1). Their main colors are dark green, yellow-green, yellow more rarely dark blue, yellow-blue-green.
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Geological and Gemological Properties of the Gümüşyurt Chrysoprase (artova-Tokat)
, 2019 Bu çalışmada Tokat-Artova’ya yaklaşık 20 km uzaklıktaki Gümüşyurt köyünün batısında geniş bir alanda yüzeyleyen krizoprasların jeolojik, mineralojik, petrografik ve gemolojik özelliklerinin ortaya konulması amaçlanmıştır.
Özen, Yeşim +2 more
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Determination of the gemological quality of raw tourmaline samples
Gemološki materijali su minerali ili materijali organskog podrijetla koji se proučavaju unutar gemologije, kako bi se identificirali, klasificirali i vrednovali.
Bistrički, Petra
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CrystalsWith the increasing market demand for spinels of various colors, purple spinel—long regarded as a symbol of nobility—has attracted growing attention. In this study, pinkish-purple to purple spinels from the Mogok region of Myanmar were systematically ...
Danyu Guo +4 more
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Attitudes of gemstone distributors to value adding strategies of ruby production
, 2004 Over the centuries, gemstones have at times played a key role in the international trade. To date, they still play a significant role in economies of many countries, especially Thailand. Ruby, the red gemstone, one of the best known gemstones to ordinary
Tiangsoongnern, L., Vuori, T.
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Disordered dolomite as an unusual biomineralization product found in the center of a natural Cassis pearl. [PDF]
PLoS One, 2023 Zhou C +6 more
europepmc +1 more source
The “yellow-skinned” Nanhong agate represents a unique variety of Nanhong agate found in northeastern Yunnan, China, and it is highly valued for its distinctive yellow exterior and clear red–yellow interface. Owing to the limited research on this variety,
Shitao Zhang +7 more
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