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Title:
Santite, a new mineral phase from Larderello, Tuscany
Authors:
Merlino, Stefano; Sartori, Franco
Affiliation:
AA(Institute of Mineralogy and Petrography, University of Pisa), AB(Institute of Mineralogy and Petrography, University of Pisa)
Publication:
Contributions to Mineralogy and Petrology, Volume 27, Issue 2, pp.159-165 (CoMP Homepage)
Publication Date:
06/1970
Origin:
SPRINGER
Abstract Copyright:
(c) 1970: Springer-Verlag
DOI:
10.1007/BF00371981
Bibliographic Code:
1970CoMP...27..159M

Abstract

A new borate mineral has been found in a sample from Larderello, mixed with larderellite and lesser amounts of sassolite. The mineral is never well crystallized, but it constantly appears as very small, clear and colourless grains; its refractive indices are: α=1.422, β=1.435, γ=1.480. Single-crystal X-ray photographs show that the mineral is orthorombic with cell dimensions: α=11.10 Å, b=11.18 Å, c=9.08 Å. X-ray powder diffraction and partial chemical analyses carried out on the whole sample (it being impossible to separate a sufficient quantity of pure material) confirm the foregoing data, according to which the mineral may be considered as the natural equivalent of the synthetic compound KB5O8 · 4H2O. It is likely that it originated from the reaction between potassium-bearing hot solutions and primary deposits of larderellite. It is named for the Tuscan naturalist Giorgio Santi.
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