This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...of its orthorhombic crystals it presents the greatest similarity to barytes. These two minerals are, in fact, isomorphous; and belonging to the same group we also have the next mineral to be considered--namely, anglesite, or lead sulphate. In Fig. 4 we have a parallel grouping of crystals of prismatic habit. These ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...of its orthorhombic crystals it presents the greatest similarity to barytes. These two minerals are, in fact, isomorphous; and belonging to the same group we also have the next mineral to be considered--namely, anglesite, or lead sulphate. In Fig. 4 we have a parallel grouping of crystals of prismatic habit. These crystals are terminated at their upper ends by the prism faces, parallel to which are perfect cleavages, enclosing an angle of 760 (corresponding to the angle of 780 in barytes). The vertical faces in the picture belong to a brachydome, and the small triangular faces on the corners belong to a macrodome. A characteristic, though not constant, feature of celestite is a faint bluish shade of color (not greenish as in picture). It is on this account that the mineral receives its name, although the color is never a deep sky-blue. White and yellowish crystals are also common. Celestite is rather lighter (sp. gr. 4.0) than barytes, but its hardness is about the same. The best methods of distinguishing between these two minerals is afforded by the colors they impart to the non-luminous flame of a Bunsen-burner. A fragment of the mineral, moistened with hydrochloric acid, is supported on platinum wire in the flame, when celestite gives CELESTITE--ANGLESITE 161 an intense crimson color and barytes a pale yellowishgreen, these being the characteristic flame colorations of all strontium and barium compounds respectively. On this property depends the use of celestite for producing the red fire of pyrotechnic displays. Another use for the strontium compounds obtained from celestite is in sugar-refining. Fine crystallized specimens of celestite are abundant in the red marls of Triassic age in the neighborhood of Bristol. Good crystals are also common in the sul...
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