Its ſpecific gravity is 6,862. All the acids diſſolve it readily and with efferveſcence, which denotes its very lax union with the inflammable principle, as was remarked before (§ 219). 182 expreſſes the quantity of phlogiſton it loſes in ſolution. It melts in a heat of 699 degrees; and if the heat be a little increaſed it takes fire; and diſſipates in white flowers[76].
ZINCUM calciforme (zinc), calciform ſimply deprived of its phlogiſton. Calciform.
Cronstedt Min. § 228. A. Lapis calaminaris.
It is almost always mixed with clay or calciform iron.
ZINCUM (zinc), mineralized by aerial acid. Aerated.
Cronstedt Min. § 228. A. 1.
ZINCUM (zinc) with aerial acid and mixed with ſiliceous matter. Siliceous.
D. A. Born ſent me chryſtals of this ſpecies, which expoſed to the fire gave out aerial acid, but they were not wholly ſoluble in acids.
ZINCUM (zinc), mineralized by ſulphur and iron. Black jack.
Cronstedt Min. §§ 229. 230. Pſeudogalena.