A rare mineral or sparkling substance (rare/archaic term, possibly referring to a naturally occurring crystalline material with glimmering properties).
Formed by combining glimmer with the mineralogical suffix -ite, which is added to names of minerals and rocks (like granite, basalt). This follows the same pattern as other mineral names.
This word is so obscure that even most geologists haven't heard it—it represents how Victorian scientists would name anything shiny or reflective they found in rocks, creating a glimpse into how scientific language was invented on the fly.
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