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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040 |a ViAlAGI  |c ViAlAGI 
072 7 |a 01B  |2 georeft 
100 1 |a Mellini, Marcello  |e analytic author  |u C.N.R., C.S. Geol. Strutturale Din. dell'Appennino, Pisa 
245 1 0 |a Carlosturanite (not "picrolite") from Taberg, Sweden 
300 |a p. 675-679 
500 |a In English. 23 refs. 
500 |a Abstract number: 87M/3085 
500 |a Abstractor: R.A.H. 
500 |a Affiliation: C.N.R., C.S. Geol. Strutturale Din. dell'Appennino; Pisa; ITA; Italy 
500 |a Affiliation: Univ. Manchester, Dep. Geol.; ; GBR; United Kingdom 
500 |a Key title: Mineralogical Magazine 
500 |a Source note: Mineralogical Magazine, 50 Part 4(358), p.675-679. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X 
500 |a Publication type: journal article 
504 |b 23 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland 
520 |a 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, (Mg<20.47`Fe<0.59`Mn<0.06`Cr<0.01`Ti<0.01`) (Si<11.68`Al<0.28`)O<27.81`(OH)<34.19`H<2`O carlosturanite can be expected to crystallize within the pure MgO-SiO<2`-H<2`O 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. 
650 7 |a Mineralogy  |2 georeft 
650 7 |a Minerals  |2 georeft 
650 7 |a Silicates  |2 georeft 
651 7 |a Europe  |2 georeft 
651 7 |a Scandinavia  |2 georeft 
651 7 |a Sweden  |2 georeft 
651 7 |a Western Europe  |2 georeft 
653 |a Carlosturanite 
653 |a Taberg 
700 1 |a Zussman, Jack,  |e analytic author  |u Univ. Manchester, Dep. Geol. 
773 0 |t Mineralogical Magazine  |d London : Mineralogical Society, Dec. 1986  |x 0026-461X  |y MNLMBB  |n Mineralogical Magazine, 50 Part 4(358), p.675-679. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X Publication type: journal article  |g Vol. 50 , Part 4, no. 358 , @No. 358  |h illus. incl. 1 table