Geographic Minerals

Gahnite, formula- ZnAl2O4, is a rare mineral belonging to the spinel group. It forms octahedral crystals which may be green, blue, yellow, brown or grey.…

Gagarinite-(Ce) previously zajacite-(Ce) is a rare radioactive fluoride mineral with formula Na(REExCa1-x)(REEyCa1-y)F6. REE refers to rare-earth elements, mostly those belonging to the lanthanide series. It…

Gadolinite, sometimes known as ytterbite, is a silicate mineral consisting principally of the silicates of cerium, lanthanum, neodymium, yttrium, beryllium, and iron with the formula…

Gabrielite is a rare thallium sulfosalt mineral with a chemical formula of Tl6Ag3Cu6(As, Sb)9S21 or Tl2AgCu2As3S7. It is a triclinic-pinacoidal black mineral containing antimony, arsenic,…

Francolite is a carbonate-rich variety of the mineral fluorapatite and is present in most sedimentary phosphorites. It is a variety of apatite. It is the…

Fassaite is a variety of augite with a very low iron content, Ca(Mg, Fe, Al)(Si, Al)2O6. It is a mineral consisting of a pale green…

Fukuchilite, Cu3FeS8, is a copper iron sulfide named after the Japanese mineralogist Nobuyo Fukuchi (1877–1934). It is a copper iron sulphide, believed by some to…

Freieslebenite is a sulfosalt mineral composed of antimony, lead, and silver. Sulfosalt minerals are complex sulfide minerals in the formula: AmBnSp. The formula is AgPbSbS3.…

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…

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 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 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…