Acuminite

Acuminite is a colorless mineral made from crystals.  It is named for the Latin word "acuminis" (meaning "sharp point" or "spearhead") for the way the crystals are made.  It is easily found in Greenland in the Ivigtut cryolite deposit.  It is easily scratched with a copper penny.Mineral Data Sheet

References

Category:Halide minerals