Fletcherite: Properties and Occurrences

Fletcherite: Properties and Occurrences

Fletcherite is a rare thiospinel sulfide mineral with formula Cu(Ni, Co)2S4. It is an isometric-hexoctahedral steel-gray mineral containing cobalt, copper, nickel, and sulfur. It is…
Fichtelite: Properties and Occurrence

Fichtelite: Properties and Occurrence

Fichtelite is a rare white mineral found in fossilized wood from Bavaria. It is a rare white monoclinic mineral found in fossilized wood from Bavaria.…
Fettelite: Properties and Occurrences

Fettelite: Properties and Occurrences

Fettelite, also known as sanguinite, is a mercury-sulfosalt mineral with the chemical formula Ag16HgAs4S15. It is a rare Silver Mercury Arsenic Sulfosalt forming silvery to…
Properties of Angles of a Triangle

Properties of Angles of a Triangle

Triangle is a plane figure with three straight sides and three angles. The three angles always add to 180°. The vertex is a corner of…
Orthorhombic Ferroselite

Orthorhombic Ferroselite

Orthorhombic ferroselite and its isometric polymorph dzharkenite are iron selenides of general formula FeSe2 precipitated under reducing conditions in anoxic environments. It is an orthorhombic-dipyramidal…
Ferropericlase

Ferropericlase

Ferropericlase or magnesiowüstite is a magnesium/iron oxide [(Mg, Fe)O] that is interpreted to be one of the main constituents of the Earth’s lower mantle together…
Order of a Surd

Order of a Surd

Order of a Surd Definitions of surds: A root of a positive real quantity is called a surd if its value cannot be exactly determined.…
Post-perovskite (pPv)

Post-perovskite (pPv)

Post-perovskite (pPv) is a high-pressure phase of magnesium silicate (MgSiO3). It is a high-pressure phase of several minerals, including magnesium silicate. It is composed of…
Ilmenite: Properties and Ooccurrences

Ilmenite: Properties and Ooccurrences

Ilmenite is the titanium-iron oxide mineral with the idealized formula FeTiO3. It is a common accessory mineral in igneous rocks, sediments, and sedimentary rocks in many…
Ferronigerite-2N1S

Ferronigerite-2N1S

Ferronigerite-2N1S is an iron, tin, alumino-hydroxide mineral that naturally occurs around sillimanite-quartz veins. It is very rarely found in gem-quality, cut-able material. Related to, and…
Induction Proof – Problems with Solutions

Induction Proof – Problems with Solutions

Induction Proof – Problems with Solutions Mathematical induction is a technique for proving a statement – a theorem, or a formula — that is asserted…
Ferro-actinolite

Ferro-actinolite

Ferro-actinolite is the ferrous iron-rich endmember of the actinolite-tremolite continuous solid solution series of the double chain calcareous amphibole group of inosilicate minerals. It is…
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