The corundum sample (not to scale) is subjected to the beam of UV-visible light in a spectrophotometer to ideally obtain e-ray as in

2018年1月26日 · Here we use corundum to present a comprehensive quantitative description of the causes of color in a gem material and illustrate its predictive power. Natural corundum has …

Approximating the location of the optical c‐axis in corundum can be accomplished using a simple dichroscope for samples with adequate color saturation or using the polariscope. These …

Search RRUFF Sample Data Search Results. Sort By: Displaying: 1 - 22 22 Records Found NAMES RRUFF ID IDEAL CHEMISTRY SOURCE LOCALITY OPTIONS; Corundum: …

Sample Description: Unoriented sample; 532 and 780 nm spectra are overwhelmed by fluorescence. Instrument settings: Thermo Almega XR 532nm @ 1% of 150mW

2000年8月17日 · CORUNDUM Sample Sample To Return These are typical corundum crystals in various views. In a metamorphic rock (schists typically) they appear as brown, prismatic …

Absorption spectroscopy has been widely used in gemstone societies as it enables the identification of the origin and post-treatment of gemstones in a non-destructive way. The …

Corundum is a oxide mineral of aluminum with the composition Al 2 O 3. The sample at left is about 6 cm across and is from Franklin, New Jersey. Pure corundum is colorless, but the …

In order to investigate the potential of FTIR as a possible analytical method for Be-detection in gemmology, three samples of colourless sapphires created by three different producers of …

2021年6月20日 · The samples used in this study are a corundum-bearing biotite-rich lithology in the Maniitsoq region with abundant tourmaline (sample 464), its host meta-pelite (462) and an …