may not work well with some computers. } In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). alert("Sorry, the print ready feature is only available in modern browsers. S - Stereo Pair on/off Note that these are colours seen in thin-section, not hand-specimen. Although some cross-hatched twinning may also occur in plagioclase, it is always very simple with only one or two cross twins per grain.
Anorthite is the light mineral in this hand sample. Of the moon! Anorthite weathers quite readily, so it’s not terribly abundant on Earth. Anorthite is the calcic end member of the plagioclase feldspar series. Twins may be wider than the twins in albite, This twinning is the most characteristic identifying feature of plagioclase, and makes its identification easy when present. html += headTags[0].innerHTML; Home Rocks and Minerals Plagioclase Feldspar (thin section) Reference URL Share . Rockhounds Discussion Group on Yahoo Groups
a = 8.177, b = 12.877, c = 14.169, Z = 8; alpha = 93.166°, beta = 115.85°, gamma = 91.216° V = 1,340.29 Den(Calc)= 2.75. else Development Section ofthe Department ofMines, and the Geological Unit of the Atomic Energy Board, conducted a prospecting programme which included some underground development and surface diamond drilling. Anorthite weathers quite readily, so it’s not terribly abundant on Earth. urchinTracker(); Print or Cut-and-Paste your Anorthite Specimen Label here : "); if (document.getElementsByTagName != null) In thin section, plagioclase commonly shows the characteristic albite polysynthetic twinning. Apollo 15 astronauts David Scott and Jim Irwin collected a hand sample with an intriguing “little white corner” which turned out to be anorthite. var gAutoPrint = true; // Flag for whether or not to automatically call the print function html += '\n\n'; PE Anorthite = 3.05 barns/electron U=PE Anorthite x rElectron Density= 8.32 barns/cc. Keyboard Grains may be bent, particularly in metamorphic rocks. Scroll down to the bottom of the page for more, including thin section photos. } Comments: Opaque white crystal of anorthite with dark brown solidified lava coating. S - Stereo }, Jeff Weissman / Photographic Guide to Mineral Species, Monte Somma and Valle di Fassa, Italy. var headTags = document.getElementsByTagName("head"); Striated - Parallel lines on crystal surface or cleavage face. var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); Euhedral Crystals - Occurs as well-formed crystals showing good external form. if (gAutoPrint) B - Bonds On/Off drag2 - RMB Resize/Rotate The Lunar Science and Planetary Institute hosts dozens of images of 15415 (and other lunar samples! return; Drag1 - Manipulate Crystal printWin.print(); To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. printWin.document.close(); { if (headTags.length > 0) if (document.getElementById != null) var printReadyElem = document.getElementById("printReady"); Biotite PPL properties. { Anorthite is the calcic end member of the plagioclase feldspar series. Scanning electron micrograph of anorthite, Anorthite in plane polars Lunar Sample 15415 was interpreted to be original moon crust and nicknamed Genesis Rock. html += printReadyElem.innerHTML; Scanning electron micrograph of anorthite, NASA’s Astromaterials Acquisition and Curation Office, synthesis of the analyses performed on 15415. Dispersion relatively weak. ), including thin sections, stereo views, and in situ photographs. { © Jeff Weissman / Photographic Guide to Mineral Species, Mouse required to differentiate them for certain. I - Indicies On the moon, however, weathering forces do not pertain; anorthite remains anorthite and constitutes much of the lunar highlands. In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). Enstatite Mg2Si2O6 °c 2001 Mineral Data Publishing, version 1.2 Crystal Data: Orthorhombic. I - Data Info F - Fit to Screen Help on Above, Foit F F , Peacor D R , American Mineralogist , 58 (1973) p.665-675, The anorthite crystal structure at 410 and 830 C, T = 410 C. Ask about Anorthite here : var html = '\n
\n'; Relief: Moderate positive Habit/Form: Euhedral crystals are not uncommon, are usually tabular parallel to (001), and have a roughly hexagonal cross section. Help on Above. Point Group: 2=m 2=m 2=m: Crystals prismatic, to 40 cm; commonly lamellar, ¯brous, or massive. if (printReadyElem != null) Warning: this large pop-up is very compute intensive and } Colorless, Gray, White, Red, Reddish gray. Location: Miyake-jima, Shizuoka, Japan. but x-ray diffraction or other tests are Mineral Discussion Forum from Fabre Minerals - also available in
function printSpecial() Magnification: 40x To view this mineral in plane polars, click here: https://youtu.be/OVtdk-ScaZY To explore this slide i…, Anorthite at webmineral.com Plagioclase Feldspar (thin section) View Description .
{ NASA’s Astromaterials Acquisition and Curation Office has a synthesis of the analyses performed on 15415. M - Menu Granular - Generally occurs as anhedral to subhedral crystals in matrix. } printWin.document.write(html); { You can find the explanation on the plagioclase feldspar page. else Drag2 - Resize Bytownite (Ca %70-90 – Na %30-10) – locality at Bytown (now the city of Ottawa), Canada. Anorthite at mindat.org. This optical mineralogy/petrography video is part of the "video atlas of minerals in thin section" library at https://www.rockptx.com. Scale: See Photo. A - Atoms On/Off From the Greek, an + orthos, "not upright" in allusion to the oblique crystals. It’s worth a read for the information, and especially for the short transcript at the beginning which captures Scott and Irwin’s giddiness at spotting the rock. Thin sections! Dbl Clk - Start-Stop Rotation } Link to . P - Polyhedra On/Off Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units) Anorthite is Not Radioactive : Anorthite Classification: Dana Class: 76.01.03.06 Tectosilicate Al-Si Framework H - Help Screen Apollo 15 astronauts David Scott and Jim Irwin collected a hand sample with an intriguing “little white corner.” The little white corner turned out to be anorthite, and the rock was interpreted to be a piece of the moon’s original crust. Mouse
- Start-Stop Rotation Twinning: Simple and lamellar twinning on f100g. You can find the explanation on the plagioclase feldspar page. Original Rockhounds Discussion Group
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