Rhombohedral Calcite


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Rhombohedral Calcite

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Sweet Home Mine rhodochrosites are immediately distinguishable for the rich coloring and rhombohedral shapes of the crystals found there. Pyrite, quartz, and tetrahedrite accent the red rhodos. DM for more info!
arkenstone_minerals
Letβs get down to Bismuth.
Bismuth (Bi) is a naturally occurring element with an atomic number of 83, chemically, it resembles arsenic and antimony.
As you can see in the image, bismuth crystals are quite obviously angular- this is because the edges of the rhombohedral crystal structure are more energetically favourable positions than the interior of the structure. As a result, molecules continually βbuild onβ the edges but donβt fill in the centre when crystallising. The higher rate of growth on the edges forms a crystal which appears to be partially hollowed out in a rectangular-spiral stair step design.
Another obvious characteristic of bismuth crystals is their beautiful colours. This is the result of surface oxidation and consequently thin film interference. The surface of the crystal oxidises to bismuth oxide in extremely thin layers. Each of these layers causes light of certain wavelengths to interfere with each other upon reflection giving rise to the colour seen on the surface. Due to variations in the thickness of the oxide layer, the crystal is not one solid colour but rather a rainbow of colours corresponding to the wavelengths of light which arise at each location. Thicker layers produce reds and greens, and thinner ones blue and violets.
Interesting note: thin-film interference is also responsible for the dazzling colours in a bubble and the rainbows in an oil-spill.
Jean O'Dwyer
Thin layer interference is also explained in another post here: https://www.facebook.com/TheEarthStory/posts/665253186869062
Calcite, displaying double refraction
βοΈπ Super prismatic Optical Calcite polished rhomb! This transparent, reflective calcite crystal has been smoothed down to a soft polish, while preserving its natural rhombohedral habit. The crystal displays the classic "optical calcite" double refraction, and shows plenty of rainbows as well. Perfect for lovers of beauty and science! βοΈπ Locality: Mexico. 1.38" x 1.18" x 1.00", 83 g (2.9 oz)--$22 on PhenomenalGems.Etsy.com. #calcite #optical #vikingssunstone #icelandspar #rhombohedral #rainbows #doublerefraction #mineral #crystal #specimen #polished #collector #display #healing #clarity #geology #phenomenalgems #etsy

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Such a stunning sea blue color on this smithsonite specimen.Β
Smithsonite by Stan Celestian Via Flickr: Kelly Mine, New Mexico Specimen is 3.5 inches tall. 85g SC2-0466
CALCITE (Calcium Carbonate) from Mexico.
Rhombohedral - Hal