Fibrous nanoinclusions in massive rose quartz.
The origin of rose coloration.

Julia S. Goreva, Chi Ma and George R. Rossman
Division of Geological and Planetary Sciences
MS 170-25
California Institute of Technology
Pasadena, CA, 91125

American Mineralogist 86, 466-472

The Mineralogical Society of America
1015 18th St NW Ste 601, Washington, DC 20036-5274 USA


Pink nanofibers were extracted from rose quartz from 29 different pegmatitic and massive vein localities throughout the world. Their width varied from 0.1 to 0.5 micrometers. 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 fibers is due to Fe-Ti intervalence charge transfer that produces an optical absorption band at 500 nm. Based on the XRD patterns and characteristics of pleochroism, the best match for these inclusions is dumortierite. 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.

Rose quartz 

Errata:  Table 2. XRD data
                          typo in the second row.  The index should be 0 4 0, not 1 4 0
                          typo on the last row.       The index should be 2 12 2, not 1 12 2