Results 41 to 50 of about 248 (94)

Supplemental Material: Rubidium (Rb) enrichment processes in a highly evolved granitic system: Insights from the petrology and geochemistry of the Guobaoshan Rb deposit in eastern Tianshan, NW China

Table S1: LA-ICP-MS zircon U-Pb dating results of the biotite granite and columbite-group minerals from the amazonite granite. Table S2: In situ Rb-Sr isotope analysis results of amazonite-bearing granites, amazonite granite, amazonite pegmatite, and ...
et al. (7893743), Shi-Bao Wu (19680984), Ru-Xiong Lei (18106628)   +2 more
core   +1 more source

A spectroscopic study of irradiation coloring of amazonite: structurally hydrous, Pb-bearing feldspar

, 1985
Irradiation-induced color in amazonite can develop only in potassium feldspar having both structurally bound H_2O and Pb impurities. Amazonite color is controlled by either (1) an absorption minimum in the β spectrum between three overlapping bands in ...
Hofmeister, Anne M., Rossman, George R.
core  

High-temperature inter-mineral potassium isotope fractionation: implications for K-Ca-Ar chronology. [PDF]

ACS Earth Space Chem, 2021
Wilson Kuhnel W, Jacobsen SB, Li Y, Ku Y, Petaev MI, Huang S, Wu Z, Wang 王昆 K.   +7 more
europepmc   +1 more source

Amazonite with cleavelandite

Photographed by Ron Wolf.Blocky pale blue amazonite occurring with whate cleavelandite, Crystal Peak area, Teller County ...
Wolf, Ron
core  

Combined micro-PIXE facility and monochromatic cathodoluminiscense spectroscopy applied to colored minerals of natural stones: an example from amazonite.

, 2005
Quantitative micro-PIXE and cathodoluminescence spectra obtained for amazonite crystals from Malawi and Brazil granitoids, in order to check the trace elements presumably responsible for their color.
Fedi M, Cossio R, Borghi A, Massi M, Giuntini L, Vaggelli G, Fiora L, Olmi F   +7 more
core  

Nascent craft specialization in the Pre-Pottery Neolithic A? Bead making at Shubayqa 6 (northeast Jordan). [PDF]

PLoS One, 2023
Thuesen MB, Alarashi H, Ruter A, Richter T.   +3 more
europepmc   +1 more source

Ecological flexibility and adaptation to past climate change in the Middle Nile Valley: A multiproxy investigation of dietary shifts between the Neolithic and Kerma periods at Kadruka 1 and Kadruka 21. [PDF]

PLoS One, 2023
Le Moyne C, Roberts P, Hua Q, Bleasdale M, Desideri J, Boivin N, Crowther A.   +6 more
europepmc   +1 more source

Geochemistry and Cosmochemistry of Potassium Stable Isotopes. [PDF]

Chem Erde, 2021
Wang K, Li W, Li S, Tian Z, Koefoed P, Zheng XY.   +5 more
europepmc   +1 more source

Smoky quartz with amazonite

Photographed by Ron Wolf.Columnar smoky quartz crystal with pale blue amazonite, Crystal Peak area, Teller County ...
Wolf, Ron
core  

Structure refinement and genetic aspects of a microcline overgrowth on amazonite from Pikes Peak batholith, Colorado, U.S.A.

, 1984
A film of white to colorless microcline commonly coats bluish green amazonite in the pocket zone of pegmatites from the Pikes Peak batholith, Colorado, U.S.A.
Martin, Robert, Blasi, Achille, Brajkovic, Anna, Zanazzi, Pier Francesco, De Pol Blasi, Carla, Foord, Eugene   +5 more
core   +1 more source