Color ranges from colorless, pale to dark gray, pale rose or violet, and white to nearly black.
Some crystals are zoned pink or green. Crystal Habits include weell formed, sharp, tabular or lath-shaped crystals forming attractive radiating sprays, parallel stacked groups and aggregates. 3 Streak is white. Associated Minerals include aegirine, albite, amphibole group, apophyllite group, arfvedsonite, ashcroftine, astrophyllite, calcite, catapleiite, donnayite, elpidite, ewaldite, fluorite, genthelvite, harmotome, labuntsovite, lorenzenite, microcline, molybdenite, narsarsukite, natrolite, nenadkevichite, pectolite, phlogopite, polylithionite, pyrite, quartz, rhodochrosite, sepiolite, sphalerite, steacyite and titanite.