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Sphalerite is a sulfide mineral with the chemical formula (Zn, Fe)S. [5] It is the most important ore of zinc . Sphalerite is found in a variety of deposit types, but it is primarily in sedimentary exhalative , Mississippi-Valley type , and volcanogenic massive sulfide deposits.
Pentlandite in pyrrhotite, ore specimen from the Sudbury Basin (field of view 3.4 cm). Pentlandite is an iron–nickel sulfide with the chemical formula (Fe,Ni) 9 S 8.Pentlandite has a narrow variation range in nickel to iron ratios (Ni:Fe), but it is usually described as 1:1.
Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
Isotropic and opaque (metallic) minerals cannot be identified this way. The stage of the microscope should be rotated until maximum colour is found, and therefore, the maximum birefringence. Each mineral, depending on the orientation, may not exhibit the maximum birefringence.
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Isotropic formulations are thermodynamically stable microemulsions possessing lyotropic liquid crystal properties. [1] They inhabit a state of matter and physical behaviour somewhere between conventional liquids and that of solid crystals . [ 2 ]
With 15.5 million U.S. adults currently diagnosed with ADHD, there is a growing focus on warning signs of the disorder. Mental health experts share the most common signs and symptoms.
Anthony Richardson scored on a 2-point conversion run up the middle with 12 seconds remaining in the fourth quarter to give the Indianapolis Colts a 25–24 win over the New England Patriots on ...