File:Anyolite (corundum-amphibole zoisitite) (Neoproterozoic; Mundarara Mine, about 27 km west of Longido, Tanzania) 2 (49144140952).jpg

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File:Anyolite (corundum-amphibole zoisitite) (Neoproterozoic; Mundarara Mine, about 27 km west of Longido, Tanzania) 2 (49144140952).jpg - Wikipedia

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Description	Anyolite from the Precambrian of Tanzania. (public display, Idaho Museum of Natural History, Pocatello, Idaho, USA) Green = Cr-zoisite Black = amphibole Reddish = ruby (corundum) This attractive rock is called anyolite, or corundum-amphibole zoisitite (or corundum-amphibole zoisite metamorphite). Anyolite is a metamorphic rock consisting of finely-crystalline chromian zoisite (green, Ca2Al3(Si2O7)(SiO4)O(OH) - calcium aluminum hydroxy-oxysilicate with Cr impurity) with minor chromian amphibole (black, apparently either chromian tschermakite and/or chromian edenite) and some large porphyroblasts of red corundum (ruby) (Al2O3 - aluminum oxide with Cr impurity). There’s also minor Ca-rich plagioclase feldspar (anorthite, CaAl2Si2O8) in this rock. Origin: Published mineralogy studies indicate that this chromian zoisite-ruby combination is the result of very high-grade metamorphism of anorthosite, an intrusive igneous rock dominated by Ca-rich plagioclase feldspar. The chromium (Cr) in the zoisite and the corundum (ruby = corundum with chromium impurity) is derived from metamorphic alteration of chromite crystals (FeCr2O4 - iron chromium oxide) in the original anorthosite unit. Chromite and chromitite (= chromite-dominated igneous rock) are commonly associated with anorthosites in LLIs (= large layered igneous intrusions, such as Montana’s Stillwater Complex). Geologic Context & Age: This Tanzanian anyolite is hosted in gneisses exposed in the Mozambique Collision Belt, an ancient, north-south trending, tectonic collision zone in eastern Africa. It dates to the Pan-African Orogeny (Neoproterozoic), during which the ancient continents of West Gondwana (~modern-day South America & Africa) and East Gondwana (~modern-day India-Australia-Antarctica) collided, forming the long-lived, small supercontinent Gondwana. Locality: Mundarara Mine, ~27 km west of Longido, northeastern Tanzania, southeastern Africa (2° 37.876’ South latitude, 36° 28.421’ East longitude) Mostly synthesized from: Game, P.M. 1954. Zoisite-amphibolite with corundum from Tanganyika. Mineralogical Magazine 30: 458-466. Mercier, A., P. Debat & J.M. Paul. 1999. Exotic origin of the ruby deposits of the Mangari area in SE Kenya. Ore Geology Reviews 14: 83-104.
Date	13 July 2011, 15:51
Source	Anyolite (corundum-amphibole zoisitite) (Neoproterozoic; Mundarara Mine, about 27 km west of Longido, Tanzania) 2
Author	James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49144140952 (archive). It was reviewed on 30 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:45, 30 November 2019		2,868 × 1,850 (4.69 MB)	Ser Amantio di Nicolao	Transferred from Flickr via #flickr2commons

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Anyolite

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Camera manufacturer	Canon
Camera model	Canon PowerShot D10
Exposure time	1/13 sec (0.076923076923077)
F-number	f/4.9
ISO speed rating	320
Date and time of data generation	15:51, 13 July 2011
Lens focal length	18.6 mm
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Bits per component	8 8 8
Pixel composition	RGB
Orientation	Normal
Number of components	3
Horizontal resolution	180 dpi
Vertical resolution	180 dpi
Software used	Adobe Photoshop Elements 16.0 (Macintosh)
File change date and time	18:33, 29 November 2019
Y and C positioning	Co-sited
Exif version	2.21
Date and time of digitizing	15:51, 13 July 2011
Meaning of each component	Y Cb Cr does not exist
Image compression mode	3
Shutter speed	3.6875
APEX aperture	4.59375
Exposure bias	0
Maximum land aperture	4.59375 APEX (f/4.91)
Metering mode	Pattern
Flash	Flash did not fire, compulsory flash suppression
Supported Flashpix version	1
Color space	sRGB
Focal plane X resolution	16,460.905349794
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File source	Digital still camera
Custom image processing	Normal process
Exposure mode	Auto exposure
White balance	Auto white balance
Digital zoom ratio	1
Scene capture type	Standard
Lens used	6.2-18.6 mm
Date metadata was last modified	13:33, 29 November 2019
Unique ID of original document	4C76C01BE16649BCF81A77958674688F

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13 July 2011

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0655449f403f1402f36a3fd00b5e527f8bbef55a

4,914,980 byte

1,850 pixel

2,868 pixel

320

0.076923076923077 second

4.9

18.6 millimetre

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