Minerals of Scotland
A Collector's Guide to Scotland's Minerals - Over 250 mineral photographs - 75 location photographs.
Introductory & illustrated articles on the minerals of the United Kingdom - Hosted Articles - Weblinks.
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Minerals and Mineralogy
Minerals, mineral identification and mineralogy.
Mineral Pictures
Quickly find more than 100 different minerals, plus 16 special picture galleries.
Minerals Used in Testing Hardness
The use of minerals in testing the hardness of gems and precious stones that are harder than a file and the gems that represent the degrees of hardness ...
MINERALS FOR SALE
All minerals for sale on this page are from our personnel collection. We are downsizing the collection in order to concentrate on collecting minerals from the United States and Thumbnails.
Minerals
This is the category of minerals in general. See List of minerals for more.
Subcategories ...
Minerals may be categorized according to whether they are opaque or transparent. A thin section of an opaque mineral such as a metal will not transmit light, whereas a thin section of a transparent mineral will.
Minerals that are "self-colored" from major chemical constituents (chromophores) that are key components in their physical makeup.
Malachite: Cu2CO3(OH)2
Peridot: Cu2CO3(OH)2
Azurite: Cu3 (CO3) 2(OH)2
Rhodonite: MnCO3 ...
In minerals with only two rays, two pleochroic colors can be detected, called dichroism.
Rare minerals can be found here too. Molybdenite up to one inch crystals can be found embedded in albite (Fig. 15). Columbite-tantalite in masses and crystals up to .
Paragenesis - The association and order of formation of minerals in a specimen or deposit.
Paramorph - A mineral which derives from another mineral, but having the same chemical composition.
Bowers Museum - Featuring the magnificent Michael Scott collection of gems and minerals
Carnegie Museum of Natural History - Hillman Hall of Minerals and Gems, Pittsburgh, PA
Harvard Mineralogical Museum - Mineral museum at Harvard University ...
Schiller (from the German term for play of colors or glitter) is an iridescent or bronze-like luster occuring in some minerals (it is also referred to as labradorescence when it occurs in feldspars).
Two different minerals are known as jade: jadeite and nephrite. Jadeite is the harder of the two; it is usually used in jewelry production. Nephrite is slightly softer and is often veined; it is used in carvings, for making beautiful bowls and vases.
Arkansas rockhounding sites also have other rare and important minerals and gemstones for rockhounding. Some to mention in this direction are diamonds, wavellite, fossils, dolomite and exotic minerals.
Your Gemstone Information Encyclopedia explaining and providing all you want to know about: Gems, crystals, minerals, diamonds, colored gems, gemstone mines, colored stones, unique bridal jewelry, sapphire, tanzanite, gem information, gem origins, ...
concentrate: dense minerals concentrated together during an extraction process while the rest of the material is rejected.
[Home] [Up] [Arizona] [Quartz] [Fossils] [Geodes] [Rocks & Minerals]
Jumbo Amethyst Crystal Points ...
Minerals
Rupert Hochleitner
identifying, learning about, and collecting the most beautiful
This Barron's guide is a new kind of book for identifying minerals, one that even beginners can use to make quick, sure identifications.
[Minerals from briny evaporates: "cranberry halite" from Nevada, green halite from Australia (color is due to pigments from crustaceans and microorganisms that lived in the salty water), ...
Minerals
Inorganic, naturally occurring materials with a constant chemical composition and regular internal atomic structure.
Mini Cross ...
View Minerals
View Tumbled Crystals
Crystal Questionnaire
This questionnaire can help you choose the crystals best suited for you.
Crystal Love ...
Minerals aren't always found as perfect crystals -- they are often partially or completely broken into smaller parts. Just how they break apart is an important identifying characteristic.
Minerals and the metals that can be extracted from them (without further modification) are also considered to belong into this category.
Natural materials include semi-precious stones, ivory, bone, wood, tusk, amber, coral, buffalo, mammoth and nut.
Gem minerals are rare, durable and beautiful by definition; this is what distinguishes them from all other minerals. Most gem deposits do not solely yield gem grade stones though.
The minerals associated with corundum are spinel, tourmaline, kyanite, magnetite, chlorite and nephelite. The gem varieties of corundum are obtained very rarely and only in a few places.
Utah Minerals Type Locality List
Fossils--Specimen Cleaning Guide
Rock Cycle-- Sedimentary, Igneous, and Metamorphic ...
Other minerals like chrysocolla have been used to imitate turquoise. Turquoise is often dyed and stabilized with resins to produce a harder stone which retains its color and polish.
Several minerals including zincite, wurtzite, and greenockite fall in this class (figs. 6.13a, b, & c).
Gangue...Minerals of no value associated in veins with ore minerals.
Geniculated... Knee like intergrowths of crystals.
Geode...A stone having a cavity lined with crystals; the cavity in such a stone.
Monoclinic minerals have a crystalline structure in which there is one two-fold axis of symmetry. Jade, Malachite and moonstone are monoclinic.
MOONSTONE ...
UNIAXIAL - Minerals (crystals) that have the unique property of single direction refraction or one optic axis. Because of this cutters must align rough pieces for proper visibility of the light reflection when preparing the gemstone.
Page 270 -- MINERALS AND ROCKS by, Dr Jiri Kourimsky - photos by F. Tvrz published by Chartwell Books, Inc. - three beautiful crystals (14 mm) in matrix.
Arsenates...Minerals in which AsO4 radical is an important constituent.
Asterism...Stones containing suitably oriented rod like inclusions or channels, that are cut as cabochon in the correct direction show this star effect. Star effect.
The Study of Minerals
This section is sponsored by the International School of Gemology. It contains some interesting photographs and information about many rare and unusual gemstones, and some that are a part of our everyday lives.
CHAPTER I. MINERALS: DEFINITION, PROPERTIES AND OCCURRENCES
1.1. The Science of Mineralogy
The science of mineralogy is the study of the physics and chemistry of natural, solid, crystalline materials.
URALIAN. Minerals from the Ural Mountains, Siberia.
VITREOUS. Glassy, as glassy lustre.
WASSIE. A large cleavage of a crystal split for cutting, as an octahedron divided into two pieces.
Of all of the minerals in the Earth's crust, the aluminosilicate, feldspar, is the most common. It is a very useful industrial mineral that finds applications in making glass, plumbing fixtures, tile and pottery.
Allochromatic minerals
If chemically pure under normal circumstances a colorless mineral. Often show a range of colors due to the presence of coloring elements (sample:managanese,cobalt, nickel, chromium, titanium).
common copper minerals they form in mesothermal and epithermal veins, they also form with carbonatites, and in hydrothermal deposits.
Association:
galena, quartz, pyrite, chalcopyrite, bornite ...
When gems and minerals are created by living organisms, they're labeled "organic." Among the well-known specimens in this category: amber, pearl, red coral, and mother of pearl.
From the mines to your jewelry box ...
Like all quartz minerals, tiger eye is
a fairly hard stone that will
take a very good polish.
It is easy to care for, and can
be maintained with most commercial
jewelry cleaning and polishing compounds.
All crystalline minerals consist of atoms packed in geometric arrays; the arrays, called crystal structures, are divided into seven crystal systems based on the symmetry of their atomic geometries.
A large group of minerals that is found in a wide area of the earth, but only a few of its members are suitable for gemstones.
Feldspars are divided into several series: ...
Thermoluminescent minerals emit bright light when heated. For example, chlorophane is a varity of fluorite that emits bright green light when heated.
THERMOSET PLASTIC ...
Zircons are common Minerals which occur naturally in clear, yellow, brown, orange and reddish-brown colors.
Zircon is frequently heat treated to enhance or alter their color.
Mohs Scale 6.5-7.5.
Phyllite
scaly minerals, micas, chlorites and clays; a term more recently applied to minerals with a layered crystal structure
Porphyry
rocks containing conspicuous phenocrysts in a fine-grained or aphanitic groundmass ...
Botanical gems are minerals that form from plants or plant material. Some botanical gems include amber (fossilized tree resin), coconut pearl (a rare, shiny, calcareous, pearl-like mineral that forms inside the coconut, Cocos nucifera), ...
Precious stones are minerals, rocks or petrified materials which when cut and polished can be used in jewelry. Diamond one of the most important precious stones is the hardest natural material on earth.
Silky: Some fibrous minerals such as gypsum and malachite have a silky luster.
Pearly: Pearls are composed of layers of nacre from which light is reflected at and near the surface.
Botanical Gems: Are minerals that form from plant material. Amber is a botanical gem.
Bouton Pearl: See Blister Pearl
Bracelet: A form of jewelry worn wrapped around the wrist.
Jackets are often used to embellish solitaire rings or simple stud earrings Jade: One of two metamorphic rocks composed of different silicate minerals, Nephite or Jadeite.
Apatite comes from the Greek word for "deceit," because it was easily confused with other minerals. Apatite has a hardness of 5 and a specific gravity of 3.15-3.22.
saline deposit Mineral environment containing minerals formed through partial or full evaporation of a mineral-rich, saline lake.
A pink and green semi-precious gemstone material composed of eleven other minerals. Mined in Nevada. Somewhat limited in supply.
Mahogany Obsidian
A variety of natural volcanic glass which is mottled with deep brownish red and black splotches.
Serpentine The name serpentine refers to a group of predominately green minerals that occur in masses of tiny inter grown crystals.
Remember that quartz, with a hardness of 7, is one of the most abundant minerals on earth, in the form of sand, or silica. When removing dust from soft stones, it's usually best to rinse them with clean water and dry with a soft cloth.
Topaz (aluminum fluorite silicate) is the hardest of the silicate minerals, due to strong chemical bonds within the stone.
also called dull, like shale or clay), greasy (like nepheline or apatite), metallic (also known as splendent, like pyrite or marcasite), resinous (like amber), pearly (with an iridescent reflectivity, like pearls or mica), pitchy (tarry minerals that ...
Its name comes from the Greek word apate, meaning "to deceive," as apatite is deceivingly similar to more-valuable minerals like olivine, beryl, peridot and topaz.
Opal is thought to form over hundreds to millions of years, after water percolates through silica-rich rock, drawing out minerals.
 See also: Mineral, Stone, Crystal, Color, Gemstone
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