Datolite

Source: Wikipedia, the free encyclopedia.
Datolite
2V angle
Measured: 74°
Dispersionr > v; weak
Ultraviolet fluorescenceFluoresces blue under SW UV
References[2][3][4]

Datolite is a

nesosilicate, 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 crystallizes in 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

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

  1. S2CID 235729616
    .
  2. ^ Handbook of Mineralogy
  3. ^ Mindat
  4. ^ Webmineral
  5. ^  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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