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Home > Concretion

Concretion

Photo By Katrin85

Concretion

Concretion

Concretion

A species of Sedimentary, Also known as Ironstone Concretion

Concretion refers to a geological formation characterized by a hard compact mass found in sediments or sedimentary rocks. It occurs through the precipitation of mineral cement, often nucleating around a pebble, fossil, or organic matter. Due to its characteristic shape, this material was often misunderstood and mistaken for fossilized eggs, turtle shells, bones, or even extraterrestrial debris.

General Info About Concretion

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Physical Properties of Concretion

Colors

Various colors, often brown, grey, black, red, yellow

Magnetism

Potentially Magnetic

Grain Size

Fine to coarse grained

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Rarity

Common

Characteristics of Concretion

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Common Questions People Also Ask

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More Rocks You Might Enjoy

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Convoluted Jasper

Convoluted Jasper is a commercial, trading name for a finely polished stone with reddish and brownish bands. The material is usually sold tumbled or carved into hearts.

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Seraphinite has a deep green background with silver or white patterns formed from mica that are reminiscent of feathers. It gets its name from the Greek word seraphim which translates to "winged heavenly being". The stone has below average hardness, making it more of a collector’s specimen than a jewelry stone. The main deposits of seraphinite are found in Russia.

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Phosphosiderite

Phosphosiderite is an orchid-purple colored mineral with yellow streaks. Iron and phosphate are the two main materials that make up this rock. It is of below average hardness, so it can be brittle and must be handled carefully. It is usually cut into a cabochon shape by jewelers so as to avoid excessive wear.

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Greywacke is a hard, dark-colored variety of sandstone sometimes used as a filler in construction. Taking on a subdued but attractive look when cut or polished, greywacke is sometimes used for flooring, decorative tiles, or flagstones. It may also be used in roads or seawalls.

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Most of the time, finding a piece of hemimorphite will garner nothing but a dull beige rock, but occasionally this mineral will present with dazzling azure crystals. Sometimes a single sample will showcase the entire spectrum of colors hemimorphite has to offer, ranging from that beige to up to bright blue. Polished pieces with that coloration are highly collectible among mineral enthusiasts.

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Wulfenite is incredibly common and easy to collect, with some of the most spectacular examples coming from areas of northern Mexico. It was first discovered in 1845 in Austria and named after a famed Austrian mineralogist. It is high in lead content, so use caution when handling this beautiful gem.

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Although phenakite is easily shaped and brilliantly iridescent, it has not caught on as a popular choice for jewelry. Instead, it is prized mostly in uncut samples for collectors. It is remarkably similar in appearance to quartz and can be misidentified by inexperienced mineral hunters.

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Ruby in Feldspar

Ruby is the red variety of the mineral known as Corundum, while Sapphire is the blue variety of the same mineral. Although Corundum is abundant, its gems are relatively rare and highly sought. In its natural crystal form, Ruby can be found trapped in different rock groundmasses. Ruby in Feldspar is one of them.