Projekt: Bestände der Universitätsbibliothek Freiberg
LDP: UB Freiberg Druckschriften
Ausgabe
4. ed., considerably augmented by Robert Allan
Strukturtyp
Monographie
Parlamentsperiode
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Wahlperiode
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Titel
Appendix: Consisting Principally Of Minerals Of Which No Authentic Analysis Has Hitherto Been Published, Or Respecting Which Fuller Information Is Required Before Their Place In The General Arrangement Can With Accuracy Be Determined
408 APPENDIX. UWAROWITE.*— Hess. H. above 6‘0. In extremely small rhomboidal dodecahedrons, of an emerald- green colour; transparent. In the matrass affords no water, and does not alter its colour. Before the blowpipe is infusible and unalterable without addition; and colours glass of borax chrome- green. By Hess this is considered a chrome-coloured garnet, but from that species it is distinguished by its infusibility before the blowpipe, by its not decrepitating, and not altering either colour or appearance. It occurs at Bissersk in the Ural Mountains. Z UIlLITE.f—Monticelli. Sp. Gr. 3-27. H. about 6 - 0. Occurs in rectangular four-sided prisms, lengthened in the di rection of their axis, and having occasionally their lateral edges replaced. Colour asparagus-green, inclining to grey. Opake- Lustre resinous. Cleavage indistinct. Fracture conchoidal- Surface of the crystals rough, frequently covered with a white coating. It is infusible before the blowpipe, but yields with bo rax a black glass. Nitric acid dissolves it, partly with efferves cence, and the solution becomes yellow. Zurlite is a VesuviaO mineral; it is generally found in large distinct crystals, associat' ed with calc spar and other species. * Named after the President of the Academy at St Petersburg, M’ Uwarow. •f In compliment to the Neapolitan minister, Sig. Zurlo.