Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Usual form. - Meionite of Vesuvius. Crystallization.—Tetragonal. Class of third order pyramid,p. 29. Axis c = Usually prisms of first order m, andsecond order a, and unit pyramid/. Angle//= 136° 15. Op-tically —, with weak refraction and double Characters. H., S to 6. Sp. gr., to Lustre, vitreous to dull. Opaque to translucent. Streak, white. Tenacity, brittle. Color, gray, green, white, bluish, reddish. Cleavage., parallel to both prisms. Before Blowpipe, Etc.—F
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Usual form. - Meionite of Vesuvius. Crystallization.—Tetragonal. Class of third order pyramid,p. 29. Axis c = Usually prisms of first order m, andsecond order a, and unit pyramid/. Angle//= 136° 15. Op-tically —, with weak refraction and double Characters. H., S to 6. Sp. gr., to Lustre, vitreous to dull. Opaque to translucent. Streak, white. Tenacity, brittle. Color, gray, green, white, bluish, reddish. Cleavage., parallel to both prisms. Before Blowpipe, Etc.—Fuses with intumescence to a whiteglass containing bubbles. Imperfectly soluble in hydrochloricacid. Remarks.—Wemerite has been formed by heat at or near fusion. It is most abun-dant in granular limestone near contact with granite or similar rock. It occurs withpyroxene, apatite, garnet, zircon, biotite, etc., and is changed to pinite, mica, talc, etc.,by atmospheric influence. Especially abundant at Bolton, Mass. Other localitiescommon in New England, New York, New Jersey and else
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