cummingtonite การใช้

• Similarly, cummingtonite has lower ferric iron and aluminium than anthophyllite.
• It is the iron endmember of the grunerite-cummingtonite series.
• Calcium, sodium and potassium concentrations in cummingtonite are low.
• Cummingtonite tends toward more calcium substitution than related anthophyllite.
• Cummingtonite has also been found in some felsic volcanic rocks such as dacites.
• Cummingtonite shares few compositional similarities with alkali amphiboles such as arfvedsonite, glaucophane-riebeckite.
• With prograde metamorphism cummingtonite and grunerite morph to members of the olivine and pyroxene series.
• It may be difficult to distinguish cummingtonite from the Mg rich variety in hand specimens.
• These are : anthophyllite, riebeckite, cummingtonite / grunerite series, and actinolite / tremolite series.
• Manganese also substitutes for ( Fe, Mg ) within cummingtonite amphibole, replacing B site atoms.
• The new minerals are found intergrown with the amphiboles anthophyllite and cummingtonite in sprays up to 5 cm long.
• The cummingtonite / grunerite series is often termed amosite or brown asbestos; riebeckite is known as crocidolite or blue asbestos.
• Associated minerals include calcite, dolomite, grossular, wollastonite, talc, diopside, forsterite, cummingtonite, riebeckite and winchite.
• Magnesiocummingtonite is considered to be an aptly named magnesium rich variety of the mineral cummingtonite which has Fe 2 + substituting for some of the Mg.
• Environmental organizations, scientists, and lawyers made the case that the tailings not only polluted Lake Superior, but that they contained cummingtonite-grunerite.
• Monoclinic cummingtonite is compositionally similar and polymorphic with orthorhombic anthophyllite, which is a much more common form of magnesium-rich amphibole, the latter being metastable.
• The upper flow facies tend to be dominated by talc, chlorite, tremolite, and other magnesian amphiboles ( anthophyllite, cummingtonite, gedrite, etc . ).
• Gedrite occurs in contact and medium to high grade metamorphic rocks in association with garnet, cordierite, anthophyllite, cummingtonite, sapphirine, sillimanite, kyanite, quartz, staurolite and biotite.
• "' Anthophyllite "'is an amphibole mineral :  & Mg 2 Mg 5 Si 8 O 22 ( OH ) 2 (  & is for a vacancy, a point defect in the crystal structure ), magnesium iron polymorphic with cummingtonite.