Minerals/Carbonides
Carbonides are naturally occurring minerals composed of 50 atomic percent, or more, carbon. Carbonide-like minerals with greater than 25 at % carbon are also included. This separates carbon containing minerals from carbonates which are at most 25 at % carbon.
Diamonds
[edit | edit source]Def. "[a] naturally occurring, glimmering glass-like allotrope of carbon in which each atom is surrounded by four others in the form of a tetrahedron"[1] is called a diamond.
The diamond imaged on the right has been estimated to be just over 1.5 carats. It measures 5 mm on edge. Although it might seem small, it has wonderful visual impact because of the clarity and perch on matrix. Embedded perhaps 50% in the matrix, so you know it is real. What is more, you can look right through the diamond to the matrix underneath! Around the diamond is a thin white layer you sometimes see, which indicates not glue but rather an alteration in the surrounding rock due to the chemical heat of formation of the crystal and is a good indication of its origins as natural.
Graphites
[edit | edit source]Graphite is a hexagonal form of carbon that often appears as tabular crystals.
Chaoites
[edit | edit source]Chaoites are another hexagonal form of native carbon. It occurs as "thin lamellae (3-15 microns wide), alternating with graphite and perpendicular to the {0001} face of graphite."[2]
"Occurs in association with graphite, zircon, and rutile in shocked graphite gneisses from Mottingen in the Ries Crater, Germany. Also observed from the Goalpara and Dyalpur carbonaceous chondrites."[2]
Lonsdaleites
[edit | edit source]"The mineral Lonsdaleite is a translucent, brownish yellow and is made from the atoms of carbon but the arrangement of these atoms is different from the arrangement of carbon atoms in a diamond. [...] The mineral is very rare and is formed naturally whenever [...] graphite containing meteorites fall on the earth and hit the surface."[3]
"Found in the Canyon Diablo and Goalpara meteorites."[2]
Fullerites
[edit | edit source]Fullerite appears to be a tentative name for the mineral occurrence of buckyballs.
"By means of high-resoluton transmission electron microscopy, both C60 and C70 fullerenes have been found in a, carbon-rich Precambrian rock from Russia The fullerenes were confirmed by Fourier transform mass spectrometry with both laser desorption and thermal desorption/electron-capture methods to verify that the fullerenes were indeed present in the geological sample".[4]
Space carbons
[edit | edit source]Apparently graphitic-like carbon particles such as shown in the image on the right have been found in space and brought back to Earth.
Organic minerals
[edit | edit source]An organic mineral appears to be a naturally occurring mineral containing one or more organic chemicals at a concentration of greater than 25 molecular %.
Carpathites
[edit | edit source]Carpathite (aka Karpatite) is a very rare organic species (C24H12).[2] It is a polycyclic aromatic hydrocarbon (PAH). This specimen is from the old Picacho Mercury Mine of California. It exhibits a radial spray of highly lustrous, canary-yellow carpathite lathes to 2.0 cm on drusy quartz. Another crossed cluster of crystals above reach 3.0 cm. It has 66.7 at % carbon.
Idrialites
[edit | edit source]With a formula of C22H14,[2] idrialites are about 61 at % carbon.
Idrialite is "a complex natural mineral composed entirely of cata-condensed polyaromatic hydrocarbons (PAHs), usually containing a thiophenic or aliphatic five-membered ring."[5]
Idrialite "(and also curtisite) represents more complex mixtures of chain-type PAHs with molecular weights ranging from 216 to 372 amu [5]."[5]
"Some of the bands in the idrialite spectra are attributed to specific vibrational modes of thiophene or fluorene-type PAHs, especially in the region bellow 1000 cm−1. These modes at 495, 705 and 750 cm−1 along with C–H or C–H2 stretching modes around 3000 cm−1 can be then used to distinguish such groups of PAHs in complicated organic mineral mixtures like idrialite."[5]
Idrialite may include benzonaphthothiophenes (chemical formula: C16H10S).[5]
Kratochvilites
[edit | edit source]Def. a "rare organic mineral [C14H10 or (C6H4)2CH2, a polymorph of fluorene], an orthorhombic hydrocarbon formed by combustion of coal or pyritic black shale deposits"[6] is called kratochvilite
Kratochvilites have about 58.3 at % carbon.
Moissanite
[edit | edit source]Moissanite is native SiC.[2]
Hoelites
[edit | edit source]Hoelites are 50 at % carbon with a formula of (C6H4)2(CO)2.[2]
Abelsonites
[edit | edit source]Abelsonites have a chemical formula of NiC31H34N4, for 44.3 at % carbon.[2]
Simonellites
[edit | edit source]Def. an "orthorhombic-dipyramidal white mineral containing carbon and hydrogen [C19H24]"[7] is called a simonellite.
Simonellites have about 44.2 at % carbon.
Hartites
[edit | edit source]Hartites have about 37 at % carbon with a formula of C20H34.[2]
Fichtelites
[edit | edit source]Def. a "rare white monoclinic organic mineral, [7-isopropyl-1,4a-dimethyl-dodecahydro-1H-phenanthrene (C19H34)],[8] found in fossilized wood"[9] is called a fichtelite.
Also, occurs in "fossilized pine wood from a peat bog; in organic-rich modern marine sediment."[10]
Fichtelites have about 35.8 at % carbon.
Evenkites
[edit | edit source]Evenkite has about 32.4 at % carbon in its formula: (CH3)2(CH2)22.[2]
Hypotheses
[edit | edit source]- The easiest resource for specific elements is as a native element mineral.
See also
[edit | edit source]References
[edit | edit source]- ↑ diamond. San Francisco, California: Wikimedia Foundation, Inc. October 16, 2012. http://en.wiktionary.org/wiki/diamond. Retrieved 2012-10-23.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 Willard Lincoln Roberts; George Robert Rapp Jr.; Julius Weber (1974). Encyclopedia of Minerals. New York, New York, USA: Van Nostrand Reinhold Company. pp. 121-2.
- ↑ payam (30 July 2013). Top 10 Hardest Material in the world. Help Tips. http://helptips.net/26/top-10-hardest-material-in-the-world/. Retrieved 2015-07-30.
- ↑ Peter R. Buseck; Semeon J. Tsipursky; Robert Hettich (10 July 1992). "Fullerenes from the Geological Environment". Science 257 (5067): 215-7. doi:10.1126/science.257.5067.215. http://www.sciencemag.org/content/257/5067/215. Retrieved 2015-07-30.
- ↑ 5.0 5.1 5.2 5.3 Otakar Frank; Jan Jehlička; Howell G.M. Edwards (15 December 2007). "Raman spectroscopy as tool for the characterization of thio-polyaromatic hydrocarbons in organic minerals". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 68 (4): 1065–9. doi:10.1016/j.saa.2006.12.033. http://www.sciencedirect.com/science/article/pii/S1386142506007621. Retrieved 2015-11-02.
- ↑ Equinox (27 October 2008). kratochvilite. San Francisco, California: Wikimedia Foundation, Inc. https://en.wiktionary.org/wiki/kratochvilite. Retrieved 2015-01-09.
- ↑ Equinox (4 September 2011). simonellite. San Francisco, California: Wikimedia Foundation, Inc. https://en.wiktionary.org/wiki/simonellite. Retrieved 2015-01-09.
- ↑ SemperBlotto (15 March 2014). fichtelite. San Francisco, California: Wikimedia Foundation, Inc. https://en.wiktionary.org/wiki/fichtelite. Retrieved 2015-01-09.
- ↑ Equinox (28 September 2010). fichtelite. San Francisco, California: Wikimedia Foundation, Inc. https://en.wiktionary.org/wiki/fichtelite. Retrieved 2015-01-09.
- ↑ R. Ruff (2005). Fichtelite. Mineral Data Publishing. http://rruff.info/doclib/hom/fichtelite.pdf. Retrieved 2015-01-09.