Nepheline Mineral

Nepheline: Nepheline found in gneiss rock Nepheline is the most abundant mineral of the feldspathoid group, which is abundantly found in the syenite igneous rocks of the volcanic eruption. Nepheline contains Sodium or Potassium with AlSiO4. Its chemical formula is (Na,K)AlSiO4. Some important physical properties of nepheline are as under; Physical Properties of Nepheline: It is vitreous greasy luster. …

Felspathoid group of minerals

The feldspathoids are anhydrous framework silicates. The amount of silica in them is lesser than felspars. Nepheline, leucite, and sodalite are the important members of this group, which are being discussed in the below lines. (1). Nepheline: Nepheline contains Sodium or Potassium with AlSiO4. Its chemical formula is (Na,K)AlSiO4. Some important physical properties of nepheline …

Abelsonite; A nickel porphyrin mineral

Abelsonite is an organic mineral nickel porphyrin (a group of heterocyclic macrocycle organic compounds) mineral, which has a chemical formula C31H32N4Ni. This mineral was discovered in 1969 in a United States state Utah, by geochemist Philip H. Abelson, so it was named after its discoverer. Porphyrins are generally found in non-crystalline form, and it is the only known …

Minerals of Felspar group

As in the previous post we have mentioned that silicate minerals are the most abundant minerals on the earth’s crust. They constitute about 90% of the earth’s crust. Apart from the silicate minerals, there are other silicate and non-silicate minerals, which are known as common minerals, among which the felspars are the most abundant of …

Minerals of silicate group

Silicate minerals are, so far, considered to be the most common rockforming minerals. They constitute a major part of the earth’s crust, which is about 90%. Silicate minerals include felspar, felspathoids, quartz, pyrozines, amphibole, micas, and olivines. Minerals other than silicate minerals, which will be discussed here, ae garnets, chlorite, serpentine, aluminium, calcium minerals, and …

Chemical Properties of Minerals

The chemical properties of the minerals depend on the chemical properties of the elements and compounds present in it. Moreover, the components of a mineral form a specific crystalline structure and thus result in definite chemical composition. The properties which are related directly to the chemical composition of the minerals are isomorphism, polymorphism, and pseudomorphism. …

Specific Gravity of the minerals

Before going through the definition of specific gravity, we need to elaborate on the concept of density first. Density is the quantity of matter per unit volume of a substance. As the quantity of matter in different substances of equal volumes is different, therefore, the densities of different substances are quite different from one another. …

Physical Properties of the Minerals

The physical properties of minerals can be determined readily by inspection or by simple tests. Because the physical properties are determined in hand specimens, they are important in the recognition of the of minerals in the field. The chief physical properties are colour, streak, lustre, hardness, habit, cleavage, fracture, odour, feel, tenacity, fluorescence, magnetism, specific …

Introduction to the minerals

Minerals A mineral is a naturally occurring homogeneous substance, which has a more or less definite chemical composition, and definite atomic structure. The minerals are usually formed by inorganic processes. They possess a set of constant physical properties. Since the determination of atomic structure and chemical composition requires complex laboratory tests, the more easily recognized …

Volcanic Activity and Plate tectonics

According to the plate tectonic theory, there are three principal zones of volcanic activities: (i) spreading centers, (ii) subduction zones, (iii) regions within the plates themselves. Let us first study the origin of magma and its relations to plate tectonics. Origin of Magma: Basaltic Magma: Most basaltic magma is believed to originate in partially molten …