$109.99
Goethite: Forms in a variety of crystal forms, radiating clusters, deep black crystals and stalactic forms. It is also known as brown iron ore and often found in matrix for other minerals like vanadinite. Banded or iridescent varieties are cut and polished into cabochons for jewelry.Named after the German statesman and poet Johann Wolfgang von Goethe. Goethe was involved in studies of natural science, writing several works on morphology, and colour theory. Goethe had the largest private collection of minerals in all of Europe with 17,800 specimens.
Siderite: Yellow-green to light to dark brown in color siderite has been known since antiquity and the name stems from the Greek sideros, meaning “iron”, alluding to its composition. It is an iron carbonate that crystallizes in the trigonal system as rhombohedrons with curved faces, and also as compact and granular masses. It occurs in a several types of environments, including sedimentary formations, carbonatites, and hydrothermal veins.
Size: .5″ X 1″ X .75″
Locality: Erongo Mountains, Namibia
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Goethite after Siderite Mineral Specimen
SIDERITE HISTORY, NAME, LOCALITIES: Siderite, pronounced SYE-der-ite, has been known since antiquity and was recognized as mineral species in 1845. Its name stems from the Greek sideros, meaning “iron,” alluding to its composition.
Siderite is abundant and widely distributed with notable collecting localities in Germany, England, Portugal, South Africa, Bolivia, Canada, and the United States (Colorado, Idaho, Arizona, North Carolina, and Connecticut).
MINERALOGY, PROPERTIES, OCCURRENCE: Siderite [iron carbonate, FeCO3] crystallizes in the trigonal system, usually as rhombohedrons with curved faces; it also occurs in compact, botryoidal, fibrous, granular, and stalactitic forms. Well-formed crystals are rare. It is usually translucent and light-to-dark brown in color; occasionally it is reddish-brown. It has a Mohs hardness of 3.5-4.0, perfect cleavage in three directions to form rhombohedrons, a vitreous-to-dull luster, a conchoidal fracture, and a specific gravity of 3.8-3.9. Siderite forms in a number of mineralogical environments, including sedimentary deposits, carbonatites, and hydrothermal veins.
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