Rose Quartz is the
rosy pink variety of Quartz. Its color is usually soft, ranging from very
light pink to medium pink in intensity and lack good transparency. It is never
transparent, and it does not form single crystals. Rose quartz is usually very
evenly colored. Rose quartz is slightly to highly turbid,
indicating the presence of the second phase, namely pink-colored fibrous
inclusions [3] [4].
Quartz single crystals
of a similar rose color are called pink quartz. The single-crystal pink
quartz is photochemically unstable, unlike massive rose quartz, it is extremely
rare.
Based on their optical properties and chemical composition,
these two types of quartz appears to be of a different nature: (1) the cause of
their color is different, (2) pink quartz is sensitive to light, while
rose quartz is not, (3) both varieties form in different environments,
and (4) pink quartz develops single crystals while rose quartz does not.
In spite of
extensive studies over the last century, the source of the rose coloration in
quartz still remains a subject of active debate. Many possible mechanisms for
the color of rose quartz have been proposed [1], but no consensus has developed.
More recently it has been suggested [3] that fibrous inclusions are
responsible for color of rose quartz. The nature of the colorizing nanofibers in
rose quartz has recently been studied [4], following the more
"direct" approach that was already chosen [3], they dissolved rose
quartz from various locations in hydrofluoric acid and extracted mats of visually
homogeneous, fine textured, flaky pink-colored nanofibers. The fibrous mineral inclusions are
rose-colored mineral and could be a mixture of dumortierite and a related
phase. The mineral makes up only about 0.05% - 0.15% of the overall weight of
rose quartz. The mineral will bleach when heated above 500°C, but will not
regain its color when irradiated. Color loss can be induced by oxidizing agents,
too, and heat treatment in a reducing atmosphere will turn heated and paled
material rose-colored again. Experiments
also show the embedded mineral fibers are not randomly oriented, but
preferrably oriented along specific crystallographic axes. Thus pink-colored fibrous inclusions cause
the coloration of rose quartz.
Pink quartz’s color is
caused by small amounts of aluminum, Al(+3), and phosphorus, P(+5),
built pairwise into the crystal lattice to replace Si(+4), and
subsequent high energy irradiation [1]. The two electrically neutral SiO4 groups
are replaced by one AlO4- and one PO4+ group.
Pink quartz is often accompanied by phosphate minerals, like (Mn,Fe)Al[(OH)2|PO4]•H2O.
Many pink quartz is translucent to
transparent. Pink quartz is very sensitive to light and will pale
quickly in direct sunlight. This is an indication that the color is due to
color centers whose formation appears to be triggered by high energy radiation.
Rose quartz occurs
at many pegmatite locations all over the world. It is commercially mined in
Madagascar, South-Africa, Namibia, U.S.A. (South Dakota), and Brazil (Bahia and
Minas Gerais). Star rose quartz is found in South Dakota and Madagascar. Pink
quartz was first found in Brazil in 1959 which is still the main source.
Pink Quartz is an extremely
rare single crystal and usually cut to make gemstone beads for
ring and pendant. Rose Quartz is an affordable gemstone, and is used in various
form of jewelry. Rose Quartz is most often used in beads with different shapes:
round, coin, oval, square, pillow, cube,
tube, et al. With Rose Quartz beads in your favorite color and shape, you even
can create your own unique piece of Rose Quartz jewelry, and with plenty of
opportunity to customize to fit your unique style. There are plenty of low-cost
Rose Quartz beads available through online store and be sure to check out the
discounted Rose Quartz beads first to start your design.
The fact that Pink
Quartz can lose its color makes it obvious that Pink Quartz jewelry should not
be worn while sunbathing. High temperature can be harmful to the Rose Quartz.
Reference:
[1] G.R. Rossman, “Colored varieties of the silica minerals”, Reviews in Mineralogy, Vol.29
[1] G.R. Rossman, “Colored varieties of the silica minerals”, Reviews in Mineralogy, Vol.29
[2] Maschmeyer, D.,
Lehmann, G. (1983) A trapped-hole center causing rose coloration of natural
quartz. Zeitschrift für Kristallographie, 163: 181-186.
[3] Applin, K.R.,
Hicks, B.D. (1987) Fibers of dumortierite in quartz. American Mineralogist, 72,
170-172
[4] Goreva, J.S.,
Ma, C., Rossman, G.R. (2001) Fibrous nanoinclusions in massive rose quartz: The
origin of rose coloration. American Mineralogist, 86: 466-471.
[5] Hori, H. (2001) Nomenclature of Quartz Color Variation: Pink and Rose. Mineralogical Record, 32(1).
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