Datolite is a calciumboronhydroxidenesosilicate, CaBSiO4(OH). It was first observed by Jens Esmark in 1806, and named by him from δατεῖσθαι, "to divide," and λίθος, "stone," in allusion to the granular structure of the massive mineral.[5]
Datolite
Datolite on sphalerite from San Luis Potosí, Mexico (size: 6.2 x 5.3 x 2.8 cm)
Datolite crystallizes in the monoclinic system forming prismatic crystals and nodular masses. The luster is vitreous and may be brown, yellow, light green or colorless. The Mohs hardness is 5.5 and the specific gravity is 2.8 - 3.0.
Polished datolite nodule from the Quincy Mine of Michigan’s Copper Country (size: 4.1 x 3.3 x 1.7 cm)
^One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Datolite". Encyclopædia Britannica. Vol. 7 (11th ed.). Cambridge University Press. p. 846.
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December 15, 2023
datolite, calcium, boron, hydroxide, nesosilicate, cabsio4, first, observed, jens, esmark, 1806, named, from, δατεῖσθαι, divide, λίθος, stone, allusion, granular, structure, massive, mineral, sphalerite, from, luis, potosí, mexico, size, generalcategorynesosil. Datolite is a calcium boron hydroxide nesosilicate CaBSiO4 OH It was first observed by Jens Esmark in 1806 and named by him from dateῖs8ai to divide and li8os stone in allusion to the granular structure of the massive mineral 5 DatoliteDatolite on sphalerite from San Luis Potosi Mexico size 6 2 x 5 3 x 2 8 cm GeneralCategoryNesosilicateFormula repeating unit CaBSiO4 OH IMA symbolDat 1 Strunz classification9 AJ 20Crystal systemMonoclinicCrystal classPrismatic 2 m same H M symbol Space groupP21 cUnit cella 9 62 b 7 6 c 4 84 A b 90 15 Z 4IdentificationColorColorless or white may be grayish yellow green pale green red pink etc Crystal habitCrystal prismatic short to tabular Botryoidal or globular with columnar structure granular to compact cryptocrystallineCleavageNoneFractureConchoidal to unevenTenacityBrittleMohs scale hardness5 to 5 5LusterVitreous rarely subresinous on fracture surfaceDiaphaneityTransparent to translucent rarely opaqueSpecific gravity2 96 3 00Optical propertiesBiaxial Refractive indexna 1 626 nb 1 653 1 654 ng 1 670Birefringenced 0 0442V angleMeasured 74 Dispersionr gt v weakUltraviolet fluorescenceFluoresces blue under SW UVReferences 2 3 4 Datolite crystallizes in the monoclinic system forming prismatic crystals and nodular masses The luster is vitreous and may be brown yellow light green or colorless The Mohs hardness is 5 5 and the specific gravity is 2 8 3 0 Polished datolite nodule from the Quincy Mine of Michigan s Copper Country size 4 1 x 3 3 x 1 7 cm The type localities are in the diabases of the Connecticut River valley and Arendal Aust Agder Norway Associated minerals include prehnite danburite babingtonite epidote native copper calcite quartz and zeolites It is common in the copper deposits of the Lake Superior region of Michigan It occurs as a secondary mineral in mafic igneous rocks often filling vesicles along with zeolites in basalt Unlike most localities throughout the world the occurrence of datolite in the Lake Superior region is usually fine grained in texture and possesses colored banding Much of the coloration is due to the inclusion of copper or associated minerals in progressive stages of hydrothermal precipitation Botryolite is a botryoidal form of datolite References edit Warr L N 2021 IMA CNMNC approved mineral symbols Mineralogical Magazine 85 3 291 320 Bibcode 2021MinM 85 291W doi 10 1180 mgm 2021 43 S2CID 235729616 Handbook of Mineralogy Mindat Webmineral nbsp One or more of the preceding sentences incorporates text from a publication now in the public domain Chisholm Hugh ed 1911 Datolite Encyclopaedia Britannica Vol 7 11th ed Cambridge University Press p 846 External links edit nbsp Wikimedia Commons has media related to Datolite Mineral galleries Retrieved from https en wikipedia org w index php title Datolite amp oldid 1140559574, wikipedia, wiki, book, books, library,
