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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical formula of mineral Cleavelandite is indicated by NaAlSi3O8 or Sodium Aluminum Silicate. Cleavelandite is a platy variety of mineral Albite Cleavelandite is actually a Silicate mineral. Mineral Cleavelandite was actually named after Parker Cleaveland, a geology and mineralogy professor at the Bowdoin College in Maine in the United States during the early 1800s. Cleavelandite is known to crystallize in the triclinic system of crystal formation. Cleavelandite is one of the mineral varieties of Albite that is commonly found displaying a very interesting microscope views under a petrographic polarizing light microscope used in optical mineralogy. Albite is also a known pivot mineral of the different feldspar series. Cleavelandite is a known variety of Albite that is commonly found associated with tourmaline. Cleavelandite minerals are commonly found extremely thin and almost platy in form and usually white in appearance. Sometimes Cleavelandite minerals can be also found having very transparent crystals.


Cleavelandite is most commonly found in white color when viewed in transmitted light of petrographic polarizing microscope used in optical mineralogy. Cleavelandite mineral crystals are commonly found showing vitreous luster when viewed in reflected light of polarizing microscope for mineralogists. Its crystal surface may also appear dull if weathered and it can be seen more clearly visible when closely evaluated under a polarized light microscope used in optical mineralogy. Cleavelandite is also most commonly found showing a perfect cleavage in one direction and almost good in another direction that are usually found forming nearly right-angled prisms when viewed with the aid of polarized light microscopes. Cleavelandite also exhibits conchoidal fracture when it is evaluated under several adjustments on the aperture diaphragm of polarizing light microscopes for mineralogists. The specific gravity measure of Cleavelandite mineral commonly gives an approximate value of 2.61 grams per cubic centimeters, which is considered average. The hardness measure of mineral Cleavelandite when it is evaluated using the Mohs scale method is usually found ranging from 6 to 6.5. Cleavelandite is usually found leaving a white streak when mineral is rubbed on a white streak plate.


Cleavelandite crystals are usually found translucent to opaque in appearance. Sometimes they may also appear as very transparent crystals. The crystal habit of mineral Cleavelandite as described in optical mineralogy commonly includes very thin and platy crystals that are more splendidly exhibited when viewed under polarized light microscope for mineralogists. Cleavelandite mineral crystals can actually grow about 15+cm across and it can maintain an even thickness of only a few millimeters. The index of refraction exhibited by mineral Cleavelandite is 1.53. Cleavelandite minerals are commonly found displaying a relatively weak dispersion when viewed in transmitted light of petrographic polarizing light microscope. Cleavelandite is also a not radioactive mineral. Cleavelandite mineral crystals are commonly twinned. They are commonly showing a type of twinning that is named after Albite. The Albite law of twinning is often found producing stacks of twin layers, which are typically only a fractions of millimeters to several millimeters thick. These twinned layers can be also found like surface striations appearing like groves on the crystals. These twins can be also found on the cleavage surfaces. The twins that are produced by the Carlsbad Law of twin are the two intergrown crystals that are often found growing in the opposite directions. The Manebach and Baveno Laws of twin, although two different twin laws, are found producing crystals with one prominent mirror plane and penetrant angles or crystal notches. Although twinned crystals are common, perfect twinned single crystal is extremely rare and twin fanciers often collect this.


Cleavelandite mineral is commonly associated with another interesting mineral species called tourmaline. The best field indicators of mineral Cleavelandite commonly include occurrence, twinning, density, crystal habit, index of refraction and its surface striation. Cleavelandite minerals are commonly used as mineral specimens. There is no specific data on the toxicity and health dangers for mineral Cleavelandite. However, mineral specimen of Cleavelandite should be treated with great care and use of sensible precaution is advised upon handling them. It is also a major constituent of hydrothermal and alpine veins, of granites and granite pegmatites as well as alkalic diorites. Cleavelandite mineral notably occurs at Labrador, Canada as well as the Scandinavian Peninsula.

Thursday, January 29th, 2009 at 4:00 am
The Silicates Mineral Class
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Click Here For Best Selection Of High Quality Polarizing Microscope