IMA 2016-117 = protoenstatite

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
Marco E. Ciriotti
Messaggi: 23424
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

IMA 2016-117 = protoenstatite

Messaggio da Marco E. Ciriotti » gio 13 lug, 2017 10:21

Prossima pubblicazione.

Referenza:
▪ Xu, H., Hill, T.R., Konishi, H., Farfan, G. (2017): Protoenstatite: A new mineral in Oregon sunstones with “watermelon” colors. American Mineralogist, 102, (in press).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Avatar utente
Marco E. Ciriotti
Messaggi: 23424
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2016-117 = protoenstatite

Messaggio da Marco E. Ciriotti » lun 02 ott, 2017 16:01

Pubblicazione avvenuta.

Referenza:
▪ Xu, H., Hill, T.R., Konishi, H., Farfan, G. (2017): Protoenstatite: A new mineral in Oregon sunstones with “watermelon” colors. American Mineralogist, 102, 2146-2149.

Abstract:
Al-Fe-bearing protoenstatite was discovered in Oregon sunstones with unusual pleochroic/dichroic red to green coloration using high-resolution transmission electron microscopy (HRTEM) and X-ray energy-dispersive spectroscopy (EDS). The empirical formula calculated on the basis of 6 O apfu is (Mg1.17Fe0.43Al0.26Ca0.03Na0.10Ti0.01)∑2.00(Si1.83Al0.17)∑2.00O6. The protoenstatite has a space group of Pbcn; its unit-cell parameters refined from selected-area electron diffraction patterns are a = 9.25(1), b = 8.78(1), and c = 5.32(1) Å. Protoenstatite nanocrystals are quenchable to low temperature. The crystallographically oriented nanocrystals of protoenstatite and clinoenstatite in association with copper nanocrystals are responsible for the unusual green and “watermelon” coloration of the labradorite gemstone.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Rispondi

Chi c’è in linea

Visitano il forum: Bing [Bot] e 3 ospiti