Cronstedt Min. § 58. Calcedonius. Chalcedony.

And perhaps the Opal. The Hydrophanus is only a variety of theſe.

Whether the carnelian, and other ſiliceæ, of finer or coarſer texture, belong to this or the preceding ſpecies I cannot yet determine with certainty.

§ 127.

TERRA SILICEA (ſiliceous earth), united to an argillaceous and highly martial earth.

Cronstedt Min. §§ 64, 65. Jaſpis. Jaſper.

§ 128.

TERRA SILICEA (ſiliceous earth), loaded with martial earth.

Martial.

Cronstedt Min. § 53.