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coined the term fluorescence
a name given to it in Elizabethan England from its use in medieval Russia as a cheaper alternative to glass in windows
The pencil is 5
for scale
Amethyst quartz SiO2
schist - greenschist - a facies of the Pelona Schist - display specimen coined the term fluorescenceThis attractive dark green schist is mapped as a greenstone schist, has an uneven foliated parting, is composed of chlorite, epidote and albite feldspar. Schists vary greatly in composition and appearance. They are often derived from clays and muds and shales and fit into a metamorphic sequence of slate, phyllite, schist and gneiss in order of increasing metamorphosis. They can also be derived from fine grained igneous rocks. This schist, a unit of
