enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Inclusion (mineral) - Wikipedia

   en.wikipedia.org/wiki/Inclusion_(mineral)

   In mineralogy, an inclusion is any material trapped inside a mineral during its formation. In gemology , it is an object enclosed within a gemstone or reaching its surface from the interior. [ 1 ] According to James Hutton 's law of inclusions, fragments included in a host rock are older than the host rock itself.

3. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Inclusions of the mineral dumortierite within quartz pieces often result in silky-appearing splotches with a blue hue. Shades of purple or gray sometimes also are present. "Dumortierite quartz" (sometimes called "blue quartz") will sometimes feature contrasting light and dark color zones across the material. [37] [38] "Blue quartz" is a minor ...

4. Tourmaline - Wikipedia

   en.wikipedia.org/wiki/Tourmaline

   The new type of tourmaline, which soon became known as paraiba tourmaline, came in blue and green. Brazilian paraiba tourmaline usually contains abundant inclusions. Much of the paraiba tourmaline from Brazil does not actually come from Paraíba, but the neighboring state of Rio Grande do Norte. Material from Rio Grande do Norte is often ...

5. S-type granite - Wikipedia

   en.wikipedia.org/wiki/S-type_granite

   Like all granites, the modal mineralogy of S-type granites are dominated by alkali- and plagioclase feldspars and quartz. Thus, S-type granites are silica over-saturated (contain quartz), and do not contain feldspathoids. An interesting feature of S-type granites, at the hand sample scale, is that alkali-feldspars are typically white in color ...

6. Cornubian batholith - Wikipedia

   en.wikipedia.org/wiki/Cornubian_batholith

   Gangue minerals include quartz, barite and fluorite. Studies on quartz fluid inclusions have shown that the fluids causing this stage are similar in composition to deep sedimentary brines which are rich in sodium, calcium and chlorine. This brine came from Permo-Triassic sedimentary rocks that once covered the entire area.

7. Optical mineralogy - Wikipedia

   en.wikipedia.org/wiki/Optical_mineralogy

   A petrographic microscope, which is an optical microscope fitted with cross-polarizing lenses, a conoscopic lens, and compensators (plates of anisotropic materials; gypsum plates and quartz wedges are common), for crystallographic analysis. Optical mineralogy is the study of minerals and rocks by measuring their optical properties.