Elbaite, the neotype material from the Rosina pegmatite, San Piero in Campo, Elba Island, Italy
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F25%3A10136987" target="_blank" >RIV/00023272:_____/25:10136987 - isvavai.cz</a>
Result on the web
<a href="https://ejm.copernicus.org/articles/37/505/2025/ejm-37-505-2025.pdf" target="_blank" >https://ejm.copernicus.org/articles/37/505/2025/ejm-37-505-2025.pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5194/ejm-37-505-2025" target="_blank" >10.5194/ejm-37-505-2025</a>
Alternative languages
Result language
angličtina
Original language name
Elbaite, the neotype material from the Rosina pegmatite, San Piero in Campo, Elba Island, Italy
Original language description
Elbaite, Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH), is a mineral species of the tourmaline supergroup. A formal description of the neotype elbaite material, approved by the International Mineralogical Association's Commission on New Minerals, Nomenclature and Classification (IMA-CNMNC), is presented in this study. Elbaite occurs in the Rosina pegmatite, San Piero in Campo, Elba island, Italy (42o44'51.35'' N, 10o12'38.02'' E). Crystals show euhedral habitus, are up to 1.5 cm in length, and are colorless with a vitreous luster, conchoidal fracture, and white streak. Elbaite has a Mohs hardness of approximately 7, has a calculated density of 3.04 g cmMINUS SIGN 3, and is uniaxial negative. It has trigonal symmetry, space group R3m, a=15.8117(2) Å, c=7.0937(1) Å, V=1535.89(4) Å3, and Z=3. The crystal structure was refined to R1=2.12 % using 1783 unique reflections collected with MoKα X-ray intensity data. The neotype elbaite originates from a nearly colorless crystal with a black to dark-green base. Chemical analysis shows a transition from Mn-rich schorl in darker areas to chemically homogeneous elbaite in lighter regions, with Fe and Mn contents decreasing significantly due to a (Li + Al) substitution. In the Rosina pegmatite, tourmaline is the primary boron mineral, increasing in abundance toward the core. Its composition reflects the pegmatite's geochemical evolution, with rising Li and Cs contents in deeper zones. Early crystallization of biotite, sekaninaite, and Fe-rich schorl removed Mg, Ti, and Fe from the system, allowing later-stage tourmaline to evolve into Fe-free, Mn-rich fluor-elbaite. The present elbaite crystals formed in cavities in the pegmatite's deeper sections. Low Mn and F contents resulted from spessartine and lepidolite crystallization, respectively. As a result, tourmaline near cavities evolved into homogeneous, nearly colorless elbaite prisms.
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
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Journal of Mineralogy
ISSN
0935-1221
e-ISSN
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Volume of the periodical
37
Issue of the periodical within the volume
4
Country of publishing house
DE - GERMANY
Number of pages
12
Pages from-to
505-516
UT code for WoS article
001532868300001
EID of the result in the Scopus database
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