Popular Mineralogy: Comprising a Familiar Account of Minerals And Their Uses
Popular Mineralogy: Comprising a Familiar Account of Minerals And Their Uses
Henry Sowerby
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This is a combination of Magnesia with Boracic acid, as its name implies. It occurs crystallized in the forms of the cube and dodecahedron variously modified, imbedded in Gypsum near Luneburg, and at a few other localities. Plate IX. fig. 33 represents two dodecahedral crystals im- bedded in the matrix, from Luneburg. BAETTES. We have now to introduce the combinations of the earth Barytes, first with Carbonic acid, and then with Sul- phuric. The first is termed WiTHEKITB. This occurs massive an...d fibrous, but generally crystallized in the form of a six-sided prism, terminated by six tri- angular planes, as in Quartz, from which its softness dis- tinguishes it readily. The crystals are usually of an opake o2 Digitized byLjOOQlC 196 POPULAR MINERALOGY. sirhite, and sometimes the planes of the two pyramids meet, to the exclusion of the prism ; occasionally, too, the crystals present a form resembling an hexagonal magnifying glass, which two varieties are represented in one specimen, in Plate IX.
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