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Illustration from 1911 Encyclopædia Britannica, article CALCITE.

Original text: The primitive rhombohedron, r {100} (fig. 1), is comparatively rare except in combination with other forms. A flatter rhombohedron, e {110}, is shown in fig. 2, and a more acute one, f {111}, in fig. 3. These three rhombohedra are related in such a manner that, when in combination, the faces of r truncate the polar edges of f, and the faces of e truncate the edges of r. The crystal of prismatic habit shown in fig. 4 is a combination of the prism m {211} and the rhombohedron e {110}; fig. 5 is a combination of the scalenohedron v {201} and the rhombohedron r {100}; and the crystal of tabular habit represented in fig. 6 is a combination of the basal pinacoid c {111}, prism m {211}, and rhombohedron e {110}.

Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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当前2006年11月17日 (五) 18:512006年11月17日 (五) 18:51版本的缩略图974 × 720(11 KB)Laverock~commonswikiIllustration from 1911 Encyclopædia Britannica, article CALCITE. Original text: The primitive rhombohedron, ''r'' {100} (fig. 1), is comparatively rare except in combination with other forms. A flatter rhombohedron, ''e'' {110}, is shown in fig. 2, and

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