File:Barytocalcite 1.png
Barytocalcite_1.png (430 × 435 pixels, file size: 4 KB, MIME type: image/png)
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Summary
| Description |
English: Illustration from 1911 Encyclopædia Britannica, article BARYTOCALCITE.
The crystals belong to the monoclinic system and are usually prismatic or blade-shaped in habit. The hardness is 4, and the sp. gr. 3.65. There are perfect cleavages parallel to the prism faces inclined at an angle of 73° 6′, and a less perfect cleavage parallel to the basal plane, the angle between which and the prism faces is 77° 6′; the angles between these three cleavages thus approximate to the angles (74° 55′) between the three cleavages of calcite, and there are other points of superficial resemblance between these two minerals. Chemically, barytocalcite is a double salt of barium and calcium carbonates, BaCa(CO3)2. |
| Date | |
| Source | Encyclopædia Britannica, 1911 |
| Author | Project Gutenberg Distributed Proofreaders |
Licensing
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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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This image comes from the Project Gutenberg archives. This is an image that has come from a book or document for which the American copyright has expired and this image is in the public domain in the United States and possibly other countries.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:51, 1 December 2008 | | 430 × 435 (4 KB) | Keith Edkins | == Summary == {{Information |Description={{en|1=Illustration from 1911 Encyclopædia Britannica, article BARYTOCALCITE. The crystals belong to the monoclinic system and are usually prismatic or blade-shaped in habit. The hardness is 4, and the sp. gr. 3. |
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