Geographic Minerals

Lignite: Properties and Occurrences

Lignite: Properties and Occurrences

Lignite, often referred to as brown coal, is a soft, brown, combustible, sedimentary rock formed from naturally compressed peat. It is a sedimentary rock that is formed from naturally compressed peat.  It is considered the lowest rank of coal due to its relatively low heat content. It has carbon.....

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Lechatelierite: Properties and Occurrences

Lechatelierite: Properties and Occurrences

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.....

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Larimar: Properties and Occurrences

Larimar: Properties and Occurrences

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.....

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Lapis lazuli: Properties and Occurrences

Lapis lazuli: Properties and Occurrences

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 .....

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Lyonsite: Properties and Occurrences

Lyonsite: Properties and Occurrences

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.....

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Lulzacite: Properties and Occurrences

Lulzacite: Properties and Occurrences

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.....

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Ludwigite: Properties and Occurrences

Ludwigite: Properties and Occurrences

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.....

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Ludlamite: Properties and Occurrences

Ludlamite: Properties and Occurrences

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 .....

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Loveringite: Properties and Occurrences

Loveringite: Properties and Occurrences

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.....

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Lorenzenite: Properties and Occurrences

Lorenzenite: Properties and Occurrences

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.....

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Lorándite: Properties and Occurrences

Lorándite: Properties and Occurrences

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 .....

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Lopezite: Properties and Occurrences

Lopezite: Properties and Occurrences

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 .....

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