b. rock resulting from metamorphism of limestone; c. an intrusive igneousrock with the same composition as andesite.
Rose Quartz-Rose Quartz’ pink to rosy-red color, unique among minerals and caused by impurities of Iron and Titanium, makes it highly desirable as a gem and ornamental stone. It occurs primarily as a cabochon in jewelry or as a carving. It occurs most often as massive formations but deposits of crystals have been found in modern times. Rutilations in Rose Quartz can create a highly attractive star effect. It is also more often translucent than transparent. Index of refraction: 1.544-1.553 Birefringence: 0.009 Hardness: 7 Cleavage: none Crystal system: trigonal
impurities in quartz will give it color in this case traces of titanium, iron or manganese
I think the color of rose quartz is usually attributed to microscopic inclusions of other minerals, rather than direct substitution of impurity elements into the quartz crystal structure. Dumortierite, an aluminum iron borate silicate, is commonly cited as a common inclusion in rose quartz. There's also some evidence that the source of color of massive rose quartz is different from that in crystalline rose quartz. Rose quartz almost always occurs in pegmatites. Pegmatites are coarse-grained rocks that form when bodies of magma cool slowly underground. The slow cooling allows very large crystals to form, and also allows some incompatible elements to become concentrated in the still-liquid portion of the magma. This leads to a coarse rock that may have a different chemical composition and different mineralogy than the source magma did.
Although pink quartz has so far only been found in pegmatites, it forms in a hydrothermal environment, at high temperatures, but from a watery solution. It can frequently be found grown on smoky quartz crystals, usually parallel to the underlying smoky crystal. Pink quartz was first found in Brazil in 1959 which is still the main source. There are some reports that indicate that it had been found in pegmatites in the U.S.A. earlier in the 1930s. Specimen seem to come mostly from Minas Gerais, from Linópolis, Galiléia, or Governador, for example. I have once seen an offer for a specimen from Situa da Conquista, Bahia, Brazil, in an OKorder auction. Pink quartz that is very similar in appearance to Brazilian specimen can be found in pegmatites in Maine, U.S.A, for example in the Mount Mica Mine in Oxford County. You can find out more about pink quartz and its characteristics in the source link provided below. Hope this would help.
