Manual of Determinative Mineralogy. With An Introduction On Blowpipe Analysis. By Samuel L. Penfield
Manual of Determinative Mineralogy. With An Introduction On Blowpipe Analysis. By Samuel L. Penfield
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In our eReader you can find the full English version of the book. Read Manual of Determinative Mineralogy. With An Introduction On Blowpipe Analysis. By Samuel L. Penfield Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Manual of Determinative Mineralogy. With An Introduction On Blowpipe Analysis. By Samuel L. Penfield
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64 rep- resents the most symmetrical arrangement of the crystal faces about the axes a -a, 6 -J, and c -c. Eight faces of the same kind are possible, all of which are developed, and the term normal form will be used for designating crystals of this charac- ter. It is also customary to designate such a form as holohedral (oAoff, whole, and eSpa^ face).
Hemihedrism. — About a system of three, unequal axes, at right angles to one another, it is possible to have forms with a lower degree of symmetr...y than that of the pyramid (Fig. 64). For example, I)rovided the axes are symmetry axes, and that there are no planes of symmetry^ the form a:b:c (111) would then consist of four faces (Fig. 65), Such a form is often designated as hemihedral{f}Mi, half, andeSpa^ face), since it has only half as many faces as are possible when the highest degree of symmetry prevails.
IIe7/iirnorp?iism.— This term is applied to the property, exhib- ited by some minerals, of having different crystalline forms at opposite extremities of an axis of symmetry.
What to read after Manual of Determinative Mineralogy. With An Introduction On Blowpipe Analysis. By Samuel L. Penfield?
You can find similar books in the "Read Also" column, or choose other free books by George Jarvis Brush to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
64 rep- resents the most symmetrical arrangement of the crystal faces about the axes a -a, 6 -J, and c -c. Eight faces of the same kind are possible, all of which are developed, and the term normal form will be used for designating crystals of this charac- ter. It is also customary to designate such a form as holohedral (oAoff, whole, and eSpa^ face).
Hemihedrism. — About a system of three, unequal axes, at right angles to one another, it is possible to have forms with a lower degree of symmetr...y than that of the pyramid (Fig. 64). For example, I)rovided the axes are symmetry axes, and that there are no planes of symmetry^ the form a:b:c (111) would then consist of four faces (Fig. 65), Such a form is often designated as hemihedral{f}Mi, half, andeSpa^ face), since it has only half as many faces as are possible when the highest degree of symmetry prevails.
IIe7/iirnorp?iism.— This term is applied to the property, exhib- ited by some minerals, of having different crystalline forms at opposite extremities of an axis of symmetry.
What to read after Manual of Determinative Mineralogy. With An Introduction On Blowpipe Analysis. By Samuel L. Penfield?
You can find similar books in the "Read Also" column, or choose other free books by George Jarvis Brush to read onlineMoreLess
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