tekstur
aphanitic, granular
foliated
warna
abu-abu gelap ke hitam
biru, kebiruan - abu-abu, ungu, nuansa biru
pemeliharaan
kurang
kurang
daya tahan
tahan lama
tahan lama
tahan air
✔
✘
✔
✘
tahan gores
✔
✘
✔
✘
tahan noda
✔
✘
✔
✘
tahan angin
✔
✘
✔
✘
tahan asam
✔
✘
✔
✘
penampilan
vesikular
kusam dan banded