Description: This listing is for a really fascinating rainbow hematite specimen in a display jar, including an info card about the specimen. This kit is great for avid mineral specimen collectors or beginners. It would be a perfect gift set for getting someone interested in mineral collecting and science. The 1 centimeter scale cube is for size comparison only. It is not included in the sale. The photos are of several different specimens, but this listings is for one specimen with an info card. The photos show multiple specimens to give a representation of the variety of shapes and colors in these specimens. I offer a shipping discount for customers who combine their payments for multiple purchases into one payment! The discount is regular shipping price for the first item and just 50 cents for each additional item! To be sure you get your shipping discount just make sure all the items you want to purchase are in your cart. Auctions you win are added to your cart automatically. For any "buy it now" items or second chance offers, be sure to click the "add to cart" button, NOT the "buy it now" button. Once all of your items are in your cart just pay for them from your cart and the combined shipping discount should be applied automatically. I offer a money back guarantee on every item I sell. If you are not 100% happy with your purchase just send me a message to let me know and I will buy back the item for your full purchase price. Hematite is an iron oxide mineral. Its color ranges from black, to metallic gray, reddish-brown, to red. The word hematite is taken from the Greek word for blood. Rainbow hematite, also known as iridescent hematite gets its rainbow hued colors from a thin coating of aluminum or phosphate crystals that scatter and refract light striking the surface. This specimen comes from the Aguas Claras mine in Minas Gerais, Brazil. It is some of the most lustrous rainbow hematite ever found and the mine is now flooded making specimens from this site very rare. If you have any questions, do not hesitate to ask me. The following is information about hematite from wikipedia: Hematite From Wikipedia, the free encyclopedia Jump to: navigation, searchFor other uses, see Hematite (disambiguation).Hematite Hematite (blood ore) from the US state of Michigan (unknown scale)GeneralCategoryOxide mineralChemical formulairon(III) oxide, Fe2O3, α-Fe2O3IdentificationColorMetallic Grey to earthy red tonesCrystal habitTabular to thick crystalsCrystal systemHexagonal (rhombohedral)CleavageNoneFractureUneven to sub-conchoidalMohs Scale hardness5.5 - 6.5LusterMetallic to splendentRefractive indexOpaquePleochroismNoneStreakBright red to dark redSpecific gravity4.9 - 5.3References[1][2]Hematite, also spelled as hæmatite, is the mineral form of Iron(III) oxide (Fe2O3), one of several iron oxides. Hematite crystallizes in the rhombohedral system, and it has the same crystal structure as ilmenite and as corundum. Hematite and ilmenite form a complete solid solution at temperatures above 950°C. Hematite is a mineral, colored black to steel or silver-gray, brown to reddish brown, or red. It is mined as the main ore of iron. Varieties include kidney ore, martite (pseudomorphs after magnetite), iron rose and specularite (specular hematite). While the forms of hematite vary, they all have a rust-red streak. Hematite is harder than pure iron, but much more brittle. Maghemite is a hematite- and magnetite-related oxide mineral. Huge deposits of hematite are found in banded iron formations. Grey hematite is typically found in places where there has been standing water or mineral hot springs, such as those in Yellowstone National Park in the United States. The mineral can precipitate out of water and collect in layers at the bottom of a lake, spring, or other standing water. Hematite can also occur without water, however, usually as the result of volcanic activity. Clay-sized hematite crystals can also occur as a secondary mineral formed by weathering processes in soil, and along with other iron oxides or oxyhydroxides such as goethite, is responsible for the red color of many tropical, ancient, or otherwise highly weathered soils. Hematite in SEM, magnification 100x Close-up of hematitic Banded Iron Formation specimen from Upper Michigan. Scale bar is 5.0 mm.Good specimens of hematite come from England, Mexico, Brazil, Australia, United States and Canada. Contents [hide]1 Ochre2 Magnetism3 Hematite on Mars4 Jewelry5 See also6 References7 External links Ochre Main article: OchreThe name hematite is derived from the Greek word for blood (haima) because hematite can be red, as in rouge, a powdered form of hematite. The color of hematite lends it well in use as a pigment. Ochre is a clay that is colored by varying amounts of hematite, varying between 20% and 70% [3]. Red ochre contains unhydrated hematite, whereas yellow ochre contains hydrated hematite (Fe2O3 • H2O). The principal use of ochre is for tinting with a permanent color[3]. Magnetism Hematite is an antiferromagnetic material below the Morin transition at 260 K, and a canted antiferromagnet or weakly ferromagnetic [1] above the Morin transition and below its Néel temperature at 948K, above which it is paramagnetic. The magnetic structure of a-hematite was the subject of considerable discussion and debate in the 1950s because it appeared to be ferromagnetic with a Curie temperature of around 1000 K, but with an extremely tiny moment (0.002mB). Adding to the surprise was a transition with a decrease in temperature at around 260 K to a phase with no net magnetic moment.[citation needed] Dzialoshinksi and later Moriya showed that the system is essentially antiferromagnetic but that the low symmetry of the cation sites allows spin–orbit coupling to cause canting of the moments when they are in the plane perpendicular to the c axis. The disappearance of the moment with a decrease in temperature at 260 K is caused by a change in the anisotropy which causes the moments to align along the c axis. In this configuration, spin canting does not reduce the energy.[citation needed] Hematite is part of a complex solid solution oxyhydroxide system having various degrees of water, hydroxyl group, and vacancy substitutions that affect the mineral's magnetic and crystal chemical properties.[4] Two other end-members are referred to as protohematite and hydrohematite. Hematite on Mars Image mosaic from the Mars Exploration Rover Microscopic Imager shows Hematite spherules partly embedded in rock at the Opportunity landing site. (Scale: image is approximately 5 cm (2 in) across)The spectral signature of hematite was seen on the planet Mars by the infrared spectrometer on the NASA Mars Global Surveyor ("MGS") and 2001 Mars Odyssey spacecraft in orbit around Mars.[5] The mineral was seen in abundance at two sites [6] on the planet, the Terra Meridiani site, near the Martian equator at 0° longitude, and the second site Aram Chaos near the Valles Marineris.[7] Several other sites also showed hematite, e.g., Aureum Chaos.[8] Because terrestrial hematite is typically a mineral formed in aqueous environments, or by aqueous alteration, this detection was scientifically interesting enough that the second of the two Mars Exploration Rovers was targeted to a site in the Terra Meridiani region designated Meridiani Planum. In-situ investigations by the Opportunity rover showed a significant amount of hematite, much of it in the form of small spherules that were informally tagged by the science team "blueberries" (a term which is somewhat confusing, since in spectrally-correct color images they are, in fact, silver-grey in color). Analysis indicates that these spherules are apparently concretions formed from a water solution. Jewelry Hematite's popularity in jewelry was at its highest in Europe during the Victorian era, while in the last 50 years it has been popular in North America, especially in the western United States where it is found in jewelry and art created by Native Americans. When polished the stone sometimes gives a look of silver. It is still popularly used in art works for making hollow portraits which go by the name of intaglios. Care should be taken in handling hematite items due to the material's susceptibility to damage.
Price: 8.98 USD
Location: Tucson, Arizona
End Time: 2024-08-09T00:35:51.000Z
Shipping Cost: 5.95 USD
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Item Specifics
Restocking Fee: No
Return shipping will be paid by: Seller
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
