The Shape of Ekanite

J 2022

The Shape of Ekanite

NASDALA, Lutz; K. A. Geeth SAMEERA; G. W. A. Rohan FERNANDO; Manfred WILDNER; Chutimun N. CHANMUANG et. al.

Základní údaje

Originální název

The Shape of Ekanite

Autoři

NASDALA, Lutz; K. A. Geeth SAMEERA; G. W. A. Rohan FERNANDO; Manfred WILDNER; Chutimun N. CHANMUANG; Gerlinde HABLER; Annalena ERLACHER a Radek ŠKODA

Vydání

Gems & Gemology, Gemological Institute of America, 2022, 0016-626X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 2.600

Kód RIV

RIV/00216224:14310/22:00128666

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.5741/GEMS.58.2.156

UT WoS

000918076100003

EID Scopus

2-s2.0-85139177150

Klíčová slova anglicky

ekanite; zircon; Sri Lankan; gem; shapes

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 16. 2. 2023 12:14, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

Despite its high thorium content, and consequent radioactivity, ekanite is still commonly traded in the Sri Lankan gem market. Gem-quality ekanite is derived from several gravel deposits in the country. However, rough specimens do not show rounded shapes that would be expected for stones transported by water; rather, they have remarkably uneven surfaces with multitudes of hollows, bumps, and cavities. Only after the recent discovery of ekanite in its host calc-silicate rock near Ampegama, Southern Province, can the striking shapes be understood. Fluid-driven alteration of ekanite, still inside the host rock, results in the formation of banded nodules with heterogeneous disintegration rims of an earthy consistency. These rims are readily removed by weathering, whereas the interior remnant consisting of chemically and physically resistant, unaltered ekanite persists.

Citovat

NASDALA, Lutz; K. A. Geeth SAMEERA; G. W. A. Rohan FERNANDO; Manfred WILDNER; Chutimun N. CHANMUANG; Gerlinde HABLER; Annalena ERLACHER a Radek ŠKODA. The Shape of Ekanite. Gems & Gemology. Gemological Institute of America, 2022, roč. 58, č. 2, s. 156-167. ISSN 0016-626X. Dostupné z: https://doi.org/10.5741/GEMS.58.2.156.

@article{2256678,
   author = {Nasdala, Lutz and Sameera, K. A. Geeth and Fernando, G. W. A. Rohan and Wildner, Manfred and Chanmuang, Chutimun N. and Habler, Gerlinde and Erlacher, Annalena and Škoda, Radek},
   article_number = {2},
   doi = {https://doi.org/10.5741/GEMS.58.2.156},
   keywords = {ekanite; zircon; Sri Lankan; gem; shapes},
   language = {eng},
   issn = {0016-626X},
   journal = {Gems & Gemology},
   title = {The Shape of Ekanite},
   url = {http://dx.doi.org/10.5741/GEMS.58.2.156},
   volume = {58},
   year = {2022}
}

TY  - JOUR
ID  - 2256678
AU  - Nasdala, Lutz - Sameera, K. A. Geeth - Fernando, G. W. A. Rohan - Wildner, Manfred - Chanmuang, Chutimun N. - Habler, Gerlinde - Erlacher, Annalena - Škoda, Radek
PY  - 2022
TI  - The Shape of Ekanite
JF  - Gems & Gemology
VL  - 58
IS  - 2
SP  - 156-167
EP  - 156-167
PB  - Gemological Institute of America
SN  - 0016626X
KW  - ekanite
KW  - zircon
KW  - Sri Lankan
KW  - gem
KW  - shapes
UR  - http://dx.doi.org/10.5741/GEMS.58.2.156
N2  - Despite its high thorium content, and consequent radioactivity, ekanite is still commonly traded in the Sri Lankan gem market. Gem-quality ekanite is derived from several gravel deposits in the country. However, rough specimens do not show rounded shapes that would be expected for stones transported by water; rather, they have remarkably uneven surfaces with multitudes of hollows, bumps, and cavities. Only after the recent discovery of ekanite in its host calc-silicate rock near Ampegama, Southern Province, can the striking shapes be understood. Fluid-driven alteration of ekanite, still inside the host rock, results in the formation of banded nodules with heterogeneous disintegration rims of an earthy consistency. These rims are readily removed by weathering, whereas the interior remnant consisting of chemically and physically resistant, unaltered ekanite persists.
ER  -

NASDALA, Lutz; K. A. Geeth SAMEERA; G. W. A. Rohan FERNANDO; Manfred WILDNER; Chutimun N. CHANMUANG; Gerlinde HABLER; Annalena ERLACHER a Radek ŠKODA. The Shape of Ekanite. \textit{Gems \&{} Gemology}. Gemological Institute of America, 2022, roč.~58, č.~2, s.~156-167. ISSN~0016-626X. Dostupné z: https://doi.org/10.5741/GEMS.58.2.156.

Přehled o publikaci