 | | Report (issue) | | DESCRIPTIVE MINERALOGY OF PENNSYLVANIA 104 Na 2Al 2 Si3 Oi .2H 2 O; SiO 2 47.4, A1 2 O 3 26.8, Na...Na 2 O 16.3, Lenni, Delaware County. Crystals. Eyerman, 1911, 11. Composition: Analysis: Fe 2 O3 CaO...Sp.gr LOCALITIES: Berks County: Birdsboro, and Gickerville; Delaware County: Leiperville, Lenni (druses...Felton's farm (Chester), and Ward's quarry; Montgomery County: Sumneytown, and Perkiomenville ; Philadelphia:...cut east of Reading (probably Birdsboro), Berks County. White, Smith, 1910, 540. silky mass of radiating |  | | Book (edition) | | in this part of the series the mineralogist has little occasion to take note. Minerals differ in specific...separate fore. CRYSTALLOGRAPHY. 11 With a little ingenuity the student may construct a goniometer...forms under each of the systems that differ but little in angles from some of other systems for example...right one of the six planes will be 3c f & la. By a little study, the expressions for the other five adjoining...adjoining faces are at right angles to one another. The little ridges of the striated surfaces are made up of |  | | Book (edition) | | mortised and tied together, so as to admit of a little movement at centre. Then, the model when in its...expressions, appearing at first sight possibly a little obscure, may be translated into simple language...[i-i] a [6>] As The abridged symbols need very little explanation additional to that given on p. 25....These relations may perhaps be made more clear by a little further through the vertical axis at Suppose a...; when this is not the case the relations are a little less simple. m MATHEMATICAL CRYSTALLOGRAPHY |  | | Book (edition) | | ^ fe o -• vO y MINERALOGY AND MINING. Mine Accidents —Ventilation — Ore Dressing, Etc. DESCRIPTIVE...lific of valuable treats and advice." PRACTICAL MINE VENTILATION. WILSON. For the Use of Mining Engineers... Copyright bt EDWARD S. DANA 1877. Press of J. J. Little & Co* Astor Place, New York. ; PREFACE. preparation...above, there is also the department of Economic Mine) alogy, which is not here and (3) in the coarser...mortised and tied together, so as to admit of a little movement at centre. Then, the model when in its |  | | Book (edition) | | COPYRIGHT BT EDWARD S. DANA 1877. Press of J. J. Little & Co* Astor Place, New York. PREFACE. " " Text-Book...mortised and tied together, so as to admit of a little movement at centre. Then, the model when in its...expressions, appearing at 'first sight possibly a little obscure, may be translated into simple language...oo : : # a a The abridged symbols need very little explanation additional to that given on p. 25....These relations may perhaps be made more clear by a little further explanation. Suppose a plane to pass through |
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