Express of a Simple Quadratic Surd
A root of a positive real quantity is called a surd if its value cannot be exactly determined. It is a number that can’t be…
Geographic Minerals
Freibergite: Properties and Occurrences
Freibergite is a complex sulfosalt mineral of silver, copper, iron, antimony and arsenic with formula (Ag, Cu, Fe)12(Sb, As)4S13. It is a complex cubic sulfosalt…
Franklinphilite
Franklinphilite is a phyllosilicate of the stilpnomelane group. It is a triclinic mineral containing aluminum, hydrogen, iron, magnesium, manganese, oxygen, potassium, silicon, sodium, and zinc.…
Franklinite: Properties and Occurrences
Franklinite is an oxide mineral belonging to the normal spinel subgroup’s iron (Fe) series, with the formula ZnFe3+2O4. It is one of the minerals found…
Frankhawthorneite
Frankhawthorneite, formula- Cu2Te6+O4(OH)2 is a monoclinic copper tellurate mineral named after Prof. Frank Christopher Hawthorne (born 1946), University of Manitoba, Winnipeg, Canada. Hawthorne has been…
Frankdicksonite
Frankdicksonite is a halide mineral with the chemical formula BaF2 which corresponds to the chemical compound barium fluoride. It is an isometric-hexoctahedral colorless mineral containing…
Frankamenite
Frankamenite is the fluorine-dominate variation of the rare mineral canasite with a general formula of K3Na3Ca5(Si12O30)[F,(OH)]4·(H2O). It is a triclinic-pedial mineral containing calcium, fluorine, hydrogen,…
Franckeite: Properties and Occurrences
Franckeite, chemical formula Pb5Sn3Sb2S14, belongs to a family of complex sulfide minerals. It is a triclinic-pinacoidal mineral containing antimony, iron, lead, sulfur, and tin. It…
Francevillite: Properties and Occurrences
Francevillite is a uranyl-group vanadate mineral in the tyuyamunite series. Its chemical formula is (Ba, Pb)(UO2)2V2O8·5(H2O). It is an orthorhombic-dipyramidal mineral containing barium, hydrogen, lead,…
Fraipontite: Properties and Occurrences
Fraipontite is a zinc-aluminum silicate mineral with a formula of (Zn, Al)3(Si, Al)2O5(OH)4. It is a member of the kaolinite-serpentine mineral group and occurs as…
Fourmarierite
Fourmarierite is a secondary uranium-lead mineral. It was named for the Belgian geologist Paul Fourmarier (1877–1970). It is a mineral consisting of a hydrous oxide…
Fougèrite: Properties and Occurrences
Fougèrite is a relatively recently described naturally occurring green rust mineral. It is a trigonal clay mineral that is chemically and structurally related to green…
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