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Chemical formula
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α-Fe 3+ O(OH) |
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Crystalline system
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orthorhombic |
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Class
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oxides |
| Origin | The Grove, Bilbao |
| Size | 2.00-3.00cm |
Massive Goethite, some of them with iridescent tones typical of the mineral.
It is a fairly widespread mineral that, among other things, is a fundamental part of limonite, a very abundant rock with an earthy or compact appearance.
Goethite usually occurs in compact, reniform or static masses, with a radiated or earthy structure. Its color is normally blackish-brown in the crystals, reddish or yellow-brown in the compact masses, and yellowish-brown to ocher-yellow in the earthy variety.
The main use of goethite is as an iron ore. On the other hand, this mineral also has some application as a clay pigment.
Fine goethite specimens are rare and are therefore valued as collectors' items. The iridescent or banded varieties are cut and polished for jewelry making.
The mineral includes a label with the name and origin and is attached to a 4 cm square cardboard box.
*The price is per unit (a single cardboard box of the four shown in the image)
Since the minerals are natural, you will receive a piece similar to the one in the photograph. The minerals come in cardboard boxes and are glued to a porex base with hot silicone; these can be removed using ethyl alcohol without damaging the mineral. The size is approximate.