VANADINITE GOETHITE Specimen Crystal Cluster Stalactite Mineral MOROCCO

Description: This specimen weighs 0.77 grams. It measures 26 mm x 8 mm x 6 mm. 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. Hi there. I am selling this absolutely amazing vanadinite on goethite crystal cluster stalactite mineral specimen. This specimen is covered with sparkly little vanadinite crystals! It is from Morocco. If you have any questions, do not hesitate to ask me. Have fun bidding, thanks so much for visiting my auction and have a great day! GoethiteFrom Wikipedia, the free encyclopediaGeneralCategoryoxide minerals, hydroxide subgroupFormula(repeating unit)α-FeO(OH)Strunz classification4.FD.10Crystal systemOrthorhombicCrystal classDipyramidal (mmm)H-M symbol: (2/m 2/m 2/m)Space groupPbnmIdentificationColorYellowish to reddish to dark brown or blackCrystal habitradial acicular, mammillary, botryoidal, stalactitic, massive, as encrustation, as pseudomorph; may be banded or iridescentCleavagePerfect {010}FractureUneven to splinteryMohs scale hardness5 - 5.5Luster Adamantine to dullStreak Brown, brownish yellow to orange yellowSpecific gravity3.3 - 4.3Refractive index Opaque to sub-translucentFusibilityFusible at 5 - 5.5SolubilityHCl solubleOther characteristicsweakly magneticReferences[1][2][3][4] Goethite (FeO(OH)), ( /ˈɡɜːrtaɪt/ GUR-tite) is an iron bearing hydroxide mineral of the diaspore group. It is found in soil and other low-temperature environments. Goethite has been well known since ancient times for its use as a pigment (brown ochre). Evidence has been found of its use in paint pigment samples taken from the caves of Lascaux in France. It was first described in 1806 based on samples found in the Hollertszug Mine in Herdorf, Germany.[3] The mineral was named after the German polymath and poet Johann Wolfgang von Goethe (1749–1832). Contents [hide] 1 Composition2Formation3 Distribution4Usage5Gallery6 See also7References8External linksComposition[edit]Goethite is an iron oxyhydroxide containing ferric iron. It is the main component of rust and bog iron ore. Goethite's hardness ranges from 5.0 to 5.5 on the Mohs Scale, and its specific gravity varies from 3.3 to 4.3. The mineral forms prismatic needle-like crystals ("needle iron ore"), but is more typically massive. Feroxyhyte and lepidocrocite are both polymorphs of the iron oxyhydroxide FeO(OH). Although they have the same chemical formula as goethite, their different crystalline structures make them distinct minerals. Formation[edit]Goethite often forms through the weathering of other iron-rich minerals, and thus is a common component of soils, concentrated in laterite soils. The formation of goethite is marked by the oxidation state change of Fe2+ (ferrous) to Fe3+ (ferric), which allows for goethite to exist at surface conditions. Because of this oxidation state change, goethite is commonly seen as a pseudomorph. As iron-bearing minerals are brought to the zone of oxidation within the soil, the iron turns from iron(II) to iron(III), while the original shape of the parent mineral is retained. Examples of common goethite pseudomorphs are: goethites after pyrite, goethite, siderite, and marcasite, though any iron(II)-bearing mineral could become a goethite pseudomorph if proper conditions are met. It may also be precipitated by groundwater or in other sedimentary conditions, or form as a primary mineral in hydrothermal deposits. Goethite has also been found to be produced by the excretion processes of certain bacteria types.[6] Distribution[edit]Goethite is found all over the planet, usually in the form of concretions, stalactitic formations, oolites (a form consisting of tiny round grains cemented together), reniform (kidney shapes) or botryoidal (globular, like bunches of grapes) accumulations. It is also a very common pseudomorph. It is frequently encountered in the swampy areas at the head of spring waters ('bog iron'), on cave floors, and on the bottom of lakes and small creeks. The boxworks or gossan resulting from the oxidation of sulfide ore deposits is formed of goethite along with other iron oxides and quartz. Significant deposits of goethite are found in England, Australia, Cuba, and Michigan, Minnesota, Missouri, Colorado, Alabama, Georgia, Virginia, and Tennessee, and Florida caves in the United States. Deposits significant in location, if not in abundance, have been found in the Martian crater Gusev by NASA's Spirit rover, providing strong evidence for the presence of liquid water on the planet in an earlier stage of its evolution. UsageIts main modern use is as an iron ore, being referred to as brown iron ore. It does have some use as a clay earth pigment. Iron-rich lateritic soils that have developed over serpentinite rocks in tropical climates are mined for their iron content, as well as other metals. Fine goethite specimens are rare and therefore are valued collectibles. Banded or iridescent varieties are cut and polished into cabochons for jewelry making. Perhaps the oldest known use of goethite comes from the ancient kingdom of Phrygia. In a royal tomb a body was found believed to be King Gordias, father of the legendary King Midas. The burial shroud had been colored with a dye containing goethite, which in its original unfaded state would have made the shroud look like it was woven from gold. Historians speculate that the legend of King Midas' golden touch might have originated from Phrygian royalty wearing clothes made from such golden-colored textiles.[8]

Price: 9.99 USD

Location: Tucson, Arizona

End Time: 2024-12-09T06:31:18.000Z

Shipping Cost: 5.95 USD