Resource Dictionary

PIMA

The PIMA (Portable Infrared Multispectral Analyser) is a hand held instrument capable of measuring the spectral reflectance of rocks and minerals in the short-wavelength infrared (SWIR) portion of the electromagnetic spectrum. It is particularly useful in recognizing the type, intensity and temperature of alteration products in a hydrothermal system. It is capable of identifying mineral species within various mineral groups such as phyllosilicates (clays, micas, chlorites, serpentine), hydroxylated silicates (epidotes, amphiboles), sulphates (alunite, jarosite, gypsum), carbonates (calcite, dolomite, ankerite, magnesite), and ammonium-bearing minerals such as buddingtonite and sodium illites.