BaSO4
|
|
Barium sulfate, sometimes with small amounts of strontium
|
|
(Ba,Sr)SO4
|
|
Colorless, white, yellow, orange, red, pink, purple, brown, blue, green, gray, and black. May also be multicolored and banded.
|
|
White
|
|
3 - 3.5
|
|