 | William Phillips - Mineralogy - 1823 - 558 pages
...doubly oblique prism as the primary form of its crystals, which presents by the reflective'goniometer in one direction, four angles of 90°; in another, four alternately of 59" 25' & 12O" 35'; in another, four, alternately of 67" 15' & 112° 45': the latter are obtained with great... | |
 | Francis Lieber, Edward Wigglesworth - Encyclopedias and dictionaries - 1835 - 630 pages
...cleavage parallel to the planes of a doubly oblique prism, which presents, by the reflective goniometer, in one direction, four angles of 90° ; in another,...120° 35°; in another, four, alternately of 67° 15f and 112° is'— the two cleavages, which are perpendicular to each other, being obtained with... | |
 | 1844 - 636 pages
...oblique prism, which presents, by the reflective goniometer, in one direction, four angles of 00° ; in another, four, alternately of 59° 25' and 120°...four, alternately of 67° 15' and 112° 45' — the two cleavages, which arc perpendicular to each other, being obtained with the greatest facility, while... | |
 | Popular encyclopedia - 1846 - 886 pages
...cleavage parallel to the planes of a doubly oblique prism, which presents, by the reflecting goniometer, in one direction, four angles of 90° ; in another,...25' and 120° 35'; in another, four, alternately of 07" 15' and 112° 45 '—the two cleavages, which are perpendicular to each other, being obtained with... | |
 | Francis Lieber - Encyclopedias and dictionaries - 1851 - 630 pages
...cleavage parallel to the planes of a doubly oblique prism, which presents, by the reflective goniometer, in one direction, four angles of 90° ; in another,...four, alternately of 67° 15/ and 112° 45' — the two cleavages, which are perpendicular to each other, being obtained with the greatest facility, while... | |
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... portion of the contents of the old species of feldspar, in which, from its wide distribution and known applications, mankind are more generally interested. Its crystals and crystalline masses yield to cleavage parallel to the planes of a doubly oblique... 