A naturally occurring black-color calcite ore. The dark color of black calcite is used to manganese oxide impurities. Black calcite ore also contains silver deposits for which it is mined (Brady 1971). It is not the same as black chalk.
G.S.Brady, Materials Handbook, 10th edition, McGraw-Hill, New York, 1971.
Sources Checked for Data in Record
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 131