From simple cubes to complex twinned dodecahedrons, pyrite appears in over a half dozen different forms. And it is certainly found in countless deposits all over the world. Pyrite is so varied and common any collector could devote an entire collecting career to this one species. Chemically pyrite is not complicated. One molecule of pyrite is composed of one atom of iron and two atoms of sulfur, iron disulfide.
What is complex about pyrite is the many crystal forms it can take and still remain in the isometric or cubic crystal system! Some pyrite crystals differ enough to be given odd names like iron cross and oscillating cubes, pyrite suns, pyrite bars and pyritized fossils. Yet cubic pyrite’s most common and very recognizable crystal form is pyritohedron. Instead of having a square crystal face of a cube as you would expect, pyritohedron faces are five-sided. Luckily today, thanks to one important deposit in Spain, the most common form for pyrite available is simply a cube on a white marl matrix.
COMMON CUBES
This story is from the June 2021 edition of Rock&Gem Magazine.
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This story is from the June 2021 edition of Rock&Gem Magazine.
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MORGAN HILL POPPY JASPER
In California, there are very few places to collect semi-precious stones. Many locations from the past have been either exhausted of the material or the land has been developed.
THE ACORN
The briolette gemstone has the same design attributes of a regular gemstone, however, the pavilion is elongated and the crown is usually domed. This is perfect for an elegant pendant, earrings or a pendulum.
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To protect a specimen cab, often a cap is needed. In my case, I had a slab with the because of the color of the background and the pattern. This background had a more silicified consistency than most sandstones. It had no graininess like most sandstone, so I'm inclined to compare it to a jasper. The pattern was typical of a dendrite.
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For the first time, the Anne Brontë rock collection underwent complete description and identification, and along with Professor Hazel Hutchison of Leeds University and Dr. Enrique Lozano Diz at ELODIZ (a company specializing in spectroscopy analysis), an analysis of that collaboration, Anne Brontë and Geology: A Study of her Collection of Stones, was published in April 2022 in Volume 47, Issue 2 of the peer-reviewed journal, Brontë Studies & Gazette.\"
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