Elbaite, the neotype material from the Rosina pegmatite, San Piero in Campo, Elba Island, Italy

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Elbaite, the neotype material from the Rosina pegmatite, San Piero in Campo, Elba Island, Italy

Popis výsledku v původním jazyce

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&apos;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&apos;51.35&apos;&apos; N, 10o12&apos;38.02&apos;&apos; 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&apos;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&apos;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.

Název v anglickém jazyce

Elbaite, the neotype material from the Rosina pegmatite, San Piero in Campo, Elba Island, Italy

Popis výsledku anglicky

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&apos;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&apos;51.35&apos;&apos; N, 10o12&apos;38.02&apos;&apos; 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&apos;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&apos;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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Journal of Mineralogy

ISSN

0935-1221

e-ISSN

—

Svazek periodika

37

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

12

Strana od-do

505-516

Kód UT WoS článku

001532868300001

EID výsledku v databázi Scopus

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