Minerals, Free Full-Text

This article reviews blue shortwave-excited luminescence (BSL) in natural minerals and synthetic materials. It also describes in detail the emission of seven minerals and gems displaying BSL, as well as three references in which BSL is caused by titanate groups (TiO6): benitoite, Ti-doped synthetic sapphire and spinel. Emission (under 254 nm shortwave excitation) and excitation spectra are provided, and fluorescence decay times are measured. It is proposed that BSL in beryl (morganite), dumortierite, hydrozincite, pezzotaite, tourmaline (elbaite), some silicates glasses, and synthetic opals is due to titanate groups present at a concentration of 20 ppmw Ti or above. They all share a broad emission with a maximum between 420 and 480 nm (2.95 to 2.58 eV) (thus perceived as blue), and an excitation spectrum peaking in the short-wave range, between 230 and 290 nm (5.39 to 4.27 eV). Furthermore, their luminescence decay time is about 20 microseconds (from 2 to 40). These three parameters are consistent with a titanate emission, and to our knowledge, no other activator.

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Minerals, Free Full-Text

INTEPRETIVE PROGRAM: Mineral or Rock: Which Is it? Saturday, August 11 2:00 pm at the Saylorville Lake Visitor Center Minerals and rocks are all around us and we have interacted with them

Minerals, Free Full-Text

Pyrochlore Supergroup: Mineral information, data and localities., ivan mesquita independência da bahia

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Minerals, Free Full-Text

Minerals, Free Full-Text

JAN-FEB, 1960 Staples are rusted and has old book smell.

VINTAGE Rocks And Minerals Magazine NUMBER 274 Mineralogy Lapidary Geology

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