This specimen is green, not brown like the photos show. 1-4mm vugs are lined with flashy green, less than 0.1mm, crystals. It is a nice representation of this phosphate mineral.
Mitridatite
Formula
Ca2Fe3+3O2(PO4)3·3H2O
Crystal System
Monoclinic
Crystal Habit
Massive, Nodular
Cleavage
Good, None, None
Luster
Adamantine - Resinous
Color
bronze red, brown green, green, greenish yellow, yellow brown