Carlosturanite (not "picrolite") from Taberg, Sweden

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Authors:Mellini, Marcello; Zussman, Jack
Author Affiliations:Primary:
C.N.R., C.S. Geol. Strutturale Din. dell'Appennino, Pisa, Italy
Other:
Univ. Manchester, Dep. Geol., United Kingdom
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 50 Part 4(358), p.675-679. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1986
Note:In English. 23 refs.; illus. incl. 1 table
Summary:The second occurrence of the asbestiform silicate carlosturanite is reported. The mineral occurs in Taberg, Sweden, and it was previously reported as 'picrolite', that is fibrous antigorite. Carlosturanite from Taberg is non-pleochroic, green in colour and has positive optical elongation. The unit cell parameters are a = 36.55, b = 9.31, c = 7.27Å, β = 101.05°. Based on the determined formula, (Mg20.47Fe0.59Mn0.06Cr0.01Ti0.01) (Si11.68Al0.28)O27.81(OH)34.19H2O carlosturanite can be expected to crystallize within the pure MgO-SiO2-H2O system as a low-grade metamorphic mineral. Because there are close similarities in structure and properties of carlosturanite and the picrolite variety of antigorite, their distinction requires careful attention to X-ray and electron diffraction patterns and chemical compositions. The present identification of the Taberg specimen as carlosturanite puts a lower limit of 33.7 Å to the known range of a parameters of antigorite. [R.A.H.]
Subjects:Mineralogy; Minerals; Silicates; Europe; Scandinavia; Sweden; Western Europe; Carlosturanite; Taberg
Abstract Numbers:87M/3085
Record ID:1987063907
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
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