Lechatelierite is silica glass, amorphous SiO2, non-crystalline mineraloid. This mineral is an amorphous form of silica formed by the fusion by the heat of silica and found in fulgurites. It is a mineral consisting of vitreous or glassy silica formed naturally by the melting of quartz sand as a r.....
Larimar also called “Stefilia’s Stone”, is a rare blue variety of the silicate mineral pectolite found only in the Dominican Republic, in the Caribbean. Its coloration varies from white, light-blue, green-blue to deep blue. It is a volcanic stone, the result of volcanic activity.....
Lapis lazuli or lapis for short is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color. It is characterized as a sodium aluminum silicate made up of Lazurite, Sulfur, Chlorine, and Hydroxyl. It’s deep, celestial blue remains .....
Lyonsite [Cu3Fe3+4 (VO4)6] is a rare black vanadate mineral that is opaque with a metallic luster. It is an orthorhombic-dipyramidal black mineral containing copper, iron, oxygen, and vanadium. It was first described in 1987 for an occurrence on the Izalco volcano, El Salvador. It was named for m.....
Lulzacite is a strontium-containing phosphate mineral with the chemical formula Sr2Fe2+(Fe2+, Mg)2Al4(PO4)4(OH)10. It is a triclinic-pinacoidal mineral containing aluminum, hydrogen, iron, magnesium, oxygen, phosphorus, and strontium. It occurs there as a dark grey to green granular aggregates wi.....
Ludwigite is a magnesium-iron borate mineral: Mg2FeBO2. It is typically formed in magnesian iron skarn and contact metamorphic deposits. It is a mineral consisting of an iron magnesium borate occurring in fibrous masses of a blackish green color. It was first described in 1874 for an occurrence i.....
Ludlamite is a rare phosphate mineral with formula: (Fe, Mn, Mg)3(PO4)2·4H2O. It is a classic phosphate mineral. It is a mineral occurring in small, green, transparent, monoclinic crystals. It is a hydrous phosphate of iron. It was first described in 1877 for an occurrence in Wheal Jane mine in .....
Loveringite is a rare metallic oxide mineral of the crichtonite group with the chemical formula (Ca, Ce) (Ti, Fe, Cr, Mg)21O38. It is a trigonal-rhombohedral black mineral containing aluminum, calcium, cerium, chromium, iron, magnesium, oxygen, titanium, vanadium, and zirconium. It is a late-stag.....
Lorenzenite is a rare sodium titanium silicate mineral with the formula Na2Ti2Si2O9. It has green cathodoluminescence and will fluoresce pale yellow or dull green in short-wave ultraviolet light. It was first identified in 1897 in rock samples from Narsarsuk, Greenland. It is an orthorhombic-dipy.....
Lorándite is a thallium arsenic sulfosalt with the chemical formula: TlAsS2. Though rare, it is the most common thallium-bearing mineral. It is cochineal- to carmine-red or dark lead-gray mineral composed of thallium sulfarsenide, occurring in monoclinic form. Lorándite was first discovered at .....
Lopezite is a rare red chromate mineral with chemical formula: K2Cr2O7. It crystallizes in the triclinic crystal system. It is a rare red triclinic chromate mineral. It is also an orange-red mineral composed of potassium dichromate. It is a mineral consisting of dichromate of potassium and found .....
Loparite-(Ce) is a granular, brittle oxide mineral of the perovskite class. It is a brown to black mineral; a variety of perovskite containing alkalies and cerium. It has the chemical formula of (Ce, Na, Ca) (Ti, Nb)O3. Nioboloparite is a variation of Loparite-(Ce) containing niobium. Loparite co.....