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Archive for December, 2009

Determining the Birefringence in Thin Section

Tuesday, December 29th, 2009

In the field of optical mineralogy, the birefringence or partial birefringence of the mineral section is determined by observing interference colors in crossed-polarized light of petrographic polarizing microscope with the diaphragm below the stage open, and using a low- or moderate-power objective lens. Using the Michael-Levy color chart, this can be illustrated diagrammatically. With the […]

Convergent Polarized Light

Tuesday, December 29th, 2009

In the field of optical mineralogy, conoscopic is the term used to describe the lens combination in the polarized microscope in obtaining interference figures. The usual arrangements produces interference figures visible in the field of the ocular of the polarizing microscope used in optical mineralogy. Such figures are particularly useful for determining the optical directions […]

Biaxial Acute Bisectrix Interference Figure

Tuesday, December 29th, 2009

A section of a positive biaxial mineral with a small 2V cut perpendicular to Z, the acute bisectrix in positive minerals when viewed with the aid of polarizing microscope used in optical mineral mineralogy. The ray of light A passes through the section obliquely and is polarized into two rays, the vibration directions of which […]

Zoisite

Tuesday, December 15th, 2009

The chemical formula of mineral Zoisite is indicated by Ca2Al3(SiO4)3(OH) or Calcium Aluminum Silicate Hydroxide. Zoisite is actually a Silicate mineral. It is most commonly used as mineral specimen and gemstone as well as ornamental stone. Zoisite is most commonly found showing nice and interested microscope appearance when viewed with the aid of polarized microscope […]

Zircon

Tuesday, December 15th, 2009

The chemical formula of mineral Zircon is indicated by ZrSiO4 or Zirconium Silicate. Zircon is actually a Silicate mineral. It is most commonly used as gemstone and mineral specimen. Zircon is usually found exhibiting nice and splendid microscope appearance when viewed with the aid of polarizing light microscope used in optical mineralogy. Zircon has been […]

Zinkenite

Tuesday, December 15th, 2009

The chemical formula of mineral Zinkenite is indicated by Pb9Sb22S42 or Lead Antimony Sulfide. Zinkenite is actually a Sulfide mineral. It is considered as a very minor ore of lead and it is most commonly used as mineral specimen. Zinkenite usually forms fine acicular crystals that appear as hair-like fibers that can be seen more […]

The Zeolite Group of Minerals

Tuesday, December 15th, 2009

The Zeolite group of minerals is an important mineral group for industrial purposes and many others. It is also the most popular mineral group for most mineral collectors. What makes it popular is the combination of its complexity, beauty, and unique crystal habits. The structure of zeolites are framework of silicates tetrahedrons interlocking each other. […]

Beryllonite

Tuesday, December 15th, 2009

The chemical formula of mineral Beryllonite is indicated by NaBePO4 or Sodium Beryllium Phosphate. Beryllonite is actually a Phosphate mineral. Beryllonite is a very rare beryllium mineral. Beryllonite is commonly used as a mineral specimen and as a gemstone for some mineral collectors. As a mineral specimen, it is most commonly found exhibiting nice and […]

Bertrandite

Tuesday, December 15th, 2009

The chemical formula of mineral Bertrandite is indicated by Be4Si2O7(OH)2 or Beryllium Silicate Hydroxide. Bertrandite is actually a Silicate mineral. Mineral Bertrandite was named after Leon Bertrand (1844-1909), a French mineralogist. It was first discovered in the year 1883 near Nantes, France. Berlinite is also considered as one of the more important ores of beryllium […]

Benitoite

Tuesday, December 15th, 2009

The chemical formula of mineral Benitoite is indicated by BaTiSi3O9 or Barium Titanium Silicate. Benitoite is actually a Silicate mineral. Benitoite mineral was only discovered at the beginning of 20th century. It was actually discovered in the year 1907 at the Dallas Gem Mine, San Benito County in California. Benitoite minerals were never found elsewhere […]

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