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Datolite - LoveToKnow 1911 (283 words) |
 | The crystals were for a long time considered to be orthorhombic, and indeed they approach closely to this system in habit, interfacial angles and optical orientation; humboldtite was the name given by A. Levy in 1823 to monoclinic crystals supposed to be distinct from datolite, but the two were afterwards proved to be identical. |
| Datolite is white or colourless, often with a greenish tinge; it is transparent or opaque. |
| Large crystals of datolite completely altered to chalcedony were formerly found with magnetite in the Haytor iron mine on Dartmoor in Devonshire;; to these pseudomorphs the name haytorite has been applied. |
| Datolite (616 words) |
| Datolite is one of the pneumatolytic minerals found in the Parker shaft at Franklin. |
| In 1926 the variety of datolite called botryolite was found at Franklin in the form of a fibrous crust with a botryoidal surface that coats axinite and rhodonite, and also cahnite in some of the veins in which that mineral was first found. |
| The datolite is snow-white and appears to be contemporaneous with the cahnite. |
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