JdS ScievUific Intelligence. — Mineralogy. 



MINERALOGY. 



13. Strontian in Aphrite. — Breithaupt has proved, by expe- 

 riment, the accuracy of his hypothesis regarding the existence 

 of strontian earth in aphrite^ by detecting it in that mineral. 



14. Calcareous Heavy Spar, or Curved Lamellar Heavy Spar, 

 which, is by Breithaupt, arranged as a distinct species, exhibits 

 the following characters : Prevailing colour white, sometimes 

 also red, grey and brown. Same primitive form as common 

 heavy spar. Crystals are reniformly or globularly grouped. 

 Lustre of principal cleavage pearly, of others vitreous. Translu- 

 cent. It decays more readily than common heavy spar, and in 

 lustre and structure resembles anhydrite. From a series of 

 experiments with heavy spar, celestine, and calc-heavy spar, 

 it results, in regard to specific gravity, that celestine z=z 3.93 to 

 3,96 ; calc-heavy spar := 4.02 to 4.29, and heavy spar = 4.30 

 to 4.58. It appears that all straight lamellar heavy spars are 

 not true heavy spar, and that no curved lamellar heavy spar is 

 really common heavy spar. The calc-heavy spar is a compound 

 of sulphate of barytes and sulphate of lime. 



15. Calaite or Mineral Turquois discovered in Lower Silesia. 

 — The principal rock from the village of Ydschwiz to Steine 

 is flinty slate. In rents of that rock there occur quartz, asbes- 

 tus, talc, and calaite. The calaite either fills up small veins, or 

 incrusts their walls in small reniform masses. 



16. Crysoprase and Chromate of Iron. — The serpentine of 

 Silesia, which is associated with gabbro, (as at Ballantrae in 

 Ayrshire), is traversed with numerous veins, in which there oc- 

 cur quartz, calcedony, hornstone, semiopal, cacholong, cryso- 

 prase, magnesite, pimelite, asbestus, talc, and kerolite. In some 

 places there are veins of chromate of iron, three feet thick. 

 Semiopal has been found in the serpentine of Scotland, but no 

 one has hitherto discovered in it the more valuable and more 

 beautiful mineral the crysoprase, although we are confident that 

 it occurs in this country. 



17. Datolite discovered at Andreasherg. — Since the discovery 

 of datolite at Arendal, in Norway, it has been found in the Ty- 

 rol, and a few other places. Lately fine crystals of this rare mi- 

 neral have been met with in the veins, along with quartz in 



