Geographic Minerals

Rose quartz – a type of quartz

Rose quartz – a type of quartz

Rose quartz is a type of quartz that exhibits a pale pink to rose red hue. A pink variety of quartz, that ranges from very pale pink to deep reddish-pink, and from opaque to transparent. The color is usually considered due to trace amounts of titanium, iron, or manganese, in the material. It is b.....

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Nabalamprophyllite: Properties and Occurrences

Nabalamprophyllite: Properties and Occurrences

Nabalamprophyllite has a general formula of Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2}. It is a monoclinic-prismatic mineral containing aluminum, barium, calcium, fluorine, hydrogen, iron, magnesium, manganese, oxygen, potassium, silicon, sodium, strontium, and titanium. The name is given for its compo.....

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Morganite: Properties and Occurrences

Morganite: Properties and Occurrences

Morganite is the pink to orange-pink variety of beryl, a mineral that includes emerald and aquamarine. It is also known as “pink beryl”, “rose beryl”, “pink emerald” and “cesian (or caesian) beryl”, is a rare light pink to a rose-colored gem-quality.....

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Menilite: Properties and Occurrences

Menilite: Properties and Occurrences

Menilite is an impure opal in brown or dull grayish concretions. It is sometimes considered a variety of opal but probably impure and really just young Flint nodules that haven’t recrystallized to quartz yet; thus really a rock rather than a mineral. The mineral make-up of these stones is calci.....

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Andradite: Properties and Occurrences

Andradite: Properties and Occurrences

Andradite is a species of the garnet group. The term Garnet describes a group name for several closely related minerals that form important gemstones, and Andradite is an individual member mineral of the Garnet group. It is a nesosilicate, with formula Ca3Fe2Si3O12. It occurs mostly in metamorpho.....

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Milky quartz – a common variety of crystalline quartz

Milky quartz – a common variety of crystalline quartz

Milky Quartz is any quartz crystal or cluster that is white in color and cloudy. It is the most common variety of crystalline quartz. The cloudy white character of the crystals is what lead to the variety name, milky. The white color is caused by minute fluid inclusions of gas, liquid, or both, t.....

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Psilomelane (Formula, Occurrence)

Psilomelane (Formula, Occurrence)

A collective name for hard black manganese oxides, including hollandite and romanechite, is Psilomelane, Barium, and manganese hydrous oxide, BaMnMn8O16(OH)4. It is an important manganese ore mineral. Barium manganese hydroxides that do not form in visible crystals are described by Psilomelane. P.....

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Geyserite: Properties and Occurrences

Geyserite: Properties and Occurrences

Geyserite is a hard opaline siliceous deposit occurring around geysers and hot springs. It is a form of opaline silica that is often found around hot springs and geysers. It is a variety of opal that is deposited around some hot springs and geysers in white or grayish concretions. It is sometim.....

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Mariposite: Properties and Occurrences

Mariposite: Properties and Occurrences

Mariposite is a chromium-rich variety of Phengite which is a discredited name for a mineral series between Muscovite and Celadonite. It is a mineral that is a chromium-rich variety of mica, which imparts an attractive green color to the generally white dolomitic marble in which it is commonly fou.....

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Muscovite: Properties and Occurrences

Muscovite: Properties and Occurrences

Muscovite is the most common mineral of the mica family. It is also known as common mica, isinglass, or potash mica is a hydrated phyllosilicate mineral of aluminum and potassium with formula KAl2(AlSi3O10)(F, OH)2, or (KF)2(Al2O3)3(SiO2)6(H2O). It is an important rock-forming mineral present in .....

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Magnesiocummingtonite: Properties and Occurrences

Magnesiocummingtonite: Properties and Occurrences

Magnesiocummingtonite is a common component of some regional metamorphic rocks. It is the magnesium-rich endmember of the cummingtonite-grunerite series of the amphibole group of minerals, with the following composition: (Mg)7Si8O22(OH)2. If more intense metamorphism were to occur, the minerals h.....

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Musgravite: Properties and Occurrences

Musgravite: Properties and Occurrences

Musgravite is an extremely rare member of the taaffeite family that was discovered in 1967 in the Musgrave Range of South Australia. It is also known as magnesiotaaffeite-6N’3S is a rare oxide mineral used as a gemstone. It is a member of the taaffeite family of minerals, and its chemical formu.....

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