. Annual report of the regents of the university on the condition of the State Cabinet of Natural History, with catalogues of the same. Science. 124 limarts Journal, January, 1848.) Massive strontianite is also said to have been found by Mr. James Heron, at Warwick, in Orange county. Dana's Mineralogy, 2d ed., p. 254. CALCAREOUS SPAR. (Mineralogy of New-York, page 215.) Of the crystallized varieties of this mineral, the most interesting- localities which have heretofore been found, perhaps, in any part of the world, exist in this State. The finest specimens have been obtained at the mines of R
. Annual report of the regents of the university on the condition of the State Cabinet of Natural History, with catalogues of the same. Science. 124 limarts Journal, January, 1848.) Massive strontianite is also said to have been found by Mr. James Heron, at Warwick, in Orange county. Dana's Mineralogy, 2d ed., p. 254. CALCAREOUS SPAR. (Mineralogy of New-York, page 215.) Of the crystallized varieties of this mineral, the most interesting- localities which have heretofore been found, perhaps, in any part of the world, exist in this State. The finest specimens have been obtained at the mines of Rossie, St. Lawrence county. One gigantic specimen in the cabinet of Prof. B. Sillirnan, Jr., weighs 165 pounds, and is nearly transparent. Dana's Mineralogy, 2d ed. The accompanying cut is the figure of a twin from Rossie, in the col- lection of Mr. Alger, of more than a foot in length. Alger's Phillips* page Mr. Dana has given a figure of a crystal differing from any of those contained in my report. S€e Sill. Jour., xlvi, p. 33. In regard to the form of the calcareous spar from Rossie, Mr. Ash- mead has remarked, that in reducing specimens to convenient size for the cabinet, he observed that some of the fractured crystals were sus- ceptible of mechanical division in different directions from those of the planes of a rhombohedron. He succeeded in obtaining as a nucleus, a solid, bounded by six isosceles triangular planes, of similar lustre, or two obtuse, three-sided pyramids, placed base to base; it has but one axis, passing through opposite solid angles; assuming the axis to be vertical, the base is an equilateral triangle. As the faces are not parallel, but inclined to each other, it is susceptible of perfect cleavage in six direc- tions. " The solid angle of the apex is similar to the obtuse solid angle of the rhombohedron, therefore, by truncating the alternate solid angles of the rhombohedron, this solid is ; Proceedings of the Academy of Nat. S
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