## An amateur's introduction to crystallography: (from morphological observations) |

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applied ascertained axes of digonal axial angles axial system axinite axis of hexagonal calculation called centre of symmetry characteristic containing the poles convenient corresponding crystal complex crystalline crystallographic cubic system derived described digonal symmetry directions drawing elements enantiomorphous equal intercepts face with indices faces parallel four axes four faces full symmetry give gonal hedral form hemi hemimorphism hemisphere hexagonal symmetry higher symmetry holohedral form intersection kind of hemihedrism law of rational merohedral forms monoclinic negative observed occur octant orthorhombic parallel faces pinakoids plane containing plane of projection plane of reference planes of symmetry poles of 100 position possible face pyramid ratio of intercepts rational indices respectively rhombohedron right angles shown in Fig side specimen sphere stereographic projection substance suppressed face symmetrically related ternary tetragonal textbooks three axes tion triclinic trigonal zone plane zone symbols

### Popular passages

Page 45 - A cos B cos C — sin A sin B sin C + cos A sin B cos C + cos A cos B sin (7 7.

Page 17 - il en est d'autres ou le chimiste, pour etre prudent, doit dire au mineralogiste ' apprenez moi ce que je vais analyser '

Page 53 - ... of society to-day — strong where strength is needed, slow where conservatism is required, capable of indefinite expansion without threatening the foundations of self-government. It lies for the time unused; but it waits...

Page 38 - ABC is a great circle of the sphere lying in the plane of the paper at right angles to the plane of projection and A A' is the trace of the plane of projection.

Page 49 - ... the great circles of which the sides of the triangle are arcs.

Page 52 - ... of the one will be the reverse of those of the other.