Gem-Quality Green Cr-Bearing Andradite (var. Demantoid) from Dobsina, Slovakia
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00111294" target="_blank" >RIV/00216224:14310/19:00111294 - isvavai.cz</a>
Result on the web
<a href="https://www.mdpi.com/2075-163X/9/3/164/htm" target="_blank" >https://www.mdpi.com/2075-163X/9/3/164/htm</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/min9030164" target="_blank" >10.3390/min9030164</a>
Alternative languages
Result language
angličtina
Original language name
Gem-Quality Green Cr-Bearing Andradite (var. Demantoid) from Dobsina, Slovakia
Original language description
Andradite, variety demantoid, is a rare gem mineral. We describe gem-quality garnet crystals from serpentinized harzburgites from Dobsina, Slovakia which were faceted. Both the andradite samples were transparent, with a vitreous luster and a vivid green color. They were isotropic with refractive indices >1.81. The measured density ranged from 3.82 to 3.84 g center dot cm(-3). Andradite var. demantoid appeared red under Chelsea filter observation. Both samples contained fibrous crystalline inclusions with the typical "horsetail" arrangement. The studied garnet had a strong Fe3+ dominant andradite composition with 1.72-1.85 apfu Fe3+, Cr3+ up to 0.15 apfu, Al3+ 0.03 to 0.04 apfu, V3+ up to 0.006 apfu substituted for Fe3+, Mn2+ up to 0.002 apfu, and Mg up to 0.04 apfu substituted for Ca. Raman spectrum of garnet showed three spectral regions containing relatively strong bands: I-352-371 cm(-1), II-816-874 cm(-1), and III-493-516 cm(-1). The optical absorption spectrum as characterized by an intense band at 438 nm and two broad bands at 587 and 623 nm and last one at 861 nm, which were assigned to Fe3+ and Cr3+. Transmission was observed in the ultraviolet spectral region (<390 nm), near the infrared region (700-800 nm), and around 530 nm in the green region of visible light, resulting in the garnet's green color.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Minerals
ISSN
2075-163X
e-ISSN
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Volume of the periodical
9
Issue of the periodical within the volume
3
Country of publishing house
CH - SWITZERLAND
Number of pages
12
Pages from-to
1-12
UT code for WoS article
000464443000002
EID of the result in the Scopus database
2-s2.0-85064330750