The twinning indicates it is plagioclase. The surrounding material is hornblende. Note the small grains on the periphery of the larger twinned center, some of which have twins identifying them as plagioclase grains. Bibliographia Humboldtiana I. Publications by Humboldt Research Fellows from abroad Earth sciences AbdelHamid, Ayman Field of research: Physical geography Host: Dr. Harald Kehl Technische Universitt Berlin Ayman AbdelHamid, Olena Dubovyk, Islam Abou ElMagd, Gunter Menz: Mapping mangroves extents on the Red Sea coastline The plagioclase in this thin section has polysynthetic twinning.
The orthopyroxene also has twinning present in most grains. The clinopyroxene is filling voids in the rock and have an anhedral structure, filling interstitial space, compared to to the plagioclase and orthopyroxene which range from subhedral to euhedral. This rock is composed predominantly of plagioclase feldspar that are large euhedral crystals Clinopyroxene twinning halloween that they formed first in the melt.
In the interstitial space there is clinopyroxene which suggests that the clinopyroxene formed after the plagioclase. CorundumSillimanite Hornfels. Corundum occurs as large crystals that are red in plane polarized light (center image) and have characteristic twinning (top image). Sillimanite occurs as small needles in the surrounding feldspar (yellowwhite inclusions in top image, and shown at high magnification in bottom image).
Sample# 5, Lab 3. This Pin was discovered by Alex Dinibtn. Discover (and save) your own Pins on Pinterest. This is a photograph of the Dhofar 850 Meteorite. This is a photo of a thin section of this meteorite Clinopyroxene twinning halloween through a microscope using transmitted cross polarized light.
A 14 wave filter was also used on this shot. The different colors indicate the mineral and crystal composition of this meteorite Bibliographia Humboldtiana Publications Earth sciences AbdelHamid, Ayman Field of research: Physical geography Host: Dr. Harald Kehl Technische Universitt Berlin Ayman AbdelHamid, Olena Dubovyk, Islam Abou ElMagd, Gunter Menz: Mapping mangroves extents on the Red Sea coastline in Egypt using polarimetric SAR and high resolution CPX (clinopyroxene showing order interference colours) and Plagioclase feldspar (with polysynthetic twinning) in XPL Find this Pin and more on My Photographs by Matthew Keyes.
CPX and Plagioclase See more. Textures& Patterns Fossil Mineralogy Krystal Terra Apollo Nasa Biology Cosmos. plag with carlsbad twinning Find this Pin and more on Geology by Lynn Recker. Photomicrograph of a thin section showing twinned, aligned plagioclase in anorthosite. Gabbro composed of plagioclase feldspar and clinopyroxene with fractured olivine.
Find this Pin and more on Simply Beautiful by Valentina Wolf. Scribd is the world's largest social reading and publishing site. polysynthetic twinning. The muscovite is pleochroic under PPL and has clinopyroxene embayed in the core. Clinopyroxene is present because the melt reacted with the clinopyroxene and create muscovite.
Leucite is also present in a minimal quantity. Garnet under the microscope. Garnet is the birthstone for January and the Capricorn zodiac sign. Find this Pin and more on Art by Thomas Here4U. Garnet is the name for a group of related minerals, common to many regions of the world and often utilized as gemstones or abrasives.