Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
Best Quality crystals were found in the intermediate zone. Well terminated crystals to 20 cm, although not as fine as those from Newport, NH. King and Pope (1990) analyzed triphylites from this locality and found that the analyses ranged from 0.32-0.34 in about 15 analyses.
Habit:
Rod-like through blocky habit
Colour:
greenish gray
Luminescent properties:
none
Quality for species:
Excellent - world class for species or very significant. (!!)
Nevel Quarry, Newry, Oxford County, Maine, USA