Record details

Title
    Fibrous nanoinclusions in massive rose quartz: The origin of rose coloration
Statement of responsibility
    Julia S. Goreva, Chi Ma, George R. Rossman
Author
    Goreva, Julia S.
    Ma, Chi
    Rossman, George R.
Language
    anglicky
Source title - serial
    American mineralogist
Vol./nr.
    Vol. 86, no. 4
Pages
    p. 466-472
Year
    2001
Notes
    3 diagr., 1 fot., 28 bibl.
    il.
    Zkr. název ser.: Amer. Mineralogist
Subject group
    barva
    drahokamy
    dumortierit
    inkluze
    křemen
    pegmatit
    studie experimentální
    teplota
    titan
    železo
Geographical name
    Brazílie
    ČR-Čechy
    Madagaskar
    Namibie
    Norsko
    Písek
    USA
Keyword
    Coloration
    Fibrous
    Massive
    Nanoinclusions
    Origin
    Quartz
    Rose
Abstract (in english)
   Pink nanofibers were extracted from rose quartz from 29 different pegmatitic and massive vein localities throughout the world. Their varied from 0.1 to 0.5 um. On the basis of optical absorption spectra of the fibers and the initial rose quartz, we conclude that these nanofibrous inclusions are the cause of coloration of massive rose quartz worldwide. These fibers do not occur in the rare, euhedral variety of pink quartz. Redox and heating experiments showed that the pink color of the fibres is due to Fe-Ti intervalence charge transfer that produces and optical absorption band at 500 nm. Based on the RXD patterns and characteristics of pleochroism, the best match for these inclusions is dumortierite. However, FTIR and Raman spectra consistently did not exactly match the standard dumortierite patterns, suggesting that this fibrous nano-phase may not be dumortierite itself, but rather a closely related material
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    21. 8. 2007
Import date
    8. 8. 2012