McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams

Home » Geology Dictionary

Geological Terms Beginning With "X"



For Terms Beginning With Other Letters Please Click Below

A     B     C     D     E     F     G     H     I     J     K     L     M     N     O     P     Q     R     S     T     U     V     W     X     Y     Z

Xenoblast

Xenoblast

A crystal that has grown in a rock during the process of metamorphism and which has not developed its characteristic crystal faces because of space limitations. These crystals typically have boundaries that are straight or that conform to the shape of adjacent crystals. The photo shows quartz and feldspar grains in a gneiss.

Xenolith

Xenolith

A preexisting rock that has been incorporated into magma without melting. When the magma crystallizes the preexisting rock fragment is known as a xenolith.

Xerophyte

Xerophyte

A plant that can survive in a very dry location or climate because it has a well-developed means of storing and conserving water. The image shows a group of cacti living on a desert floor.

X-ray Diffraction

X-ray Diffraction (XRD)

A technique used to identify minerals and other crystalline materials by bombarding them with X-rays. Planes of repetition within the atomic structure of the mineral diffract the X-rays. The pattern of diffraction is unique for each mineral structure and can be used for identification. This method of identification is much more reliable than hand-specimen identification and is used when hand-specimen identification is not possible or difficult.

X-ray Diffractogram

X-ray Diffractogram

A printed or digital record of an x-ray diffraction analysis. It shows the angle of diffraction on the horizontal axis and the intensity of diffraction on the vertical axis. Peaks on the diffractogram are characteristic of the material being examined and can be compared with reference diffractograms to identify minerals and other crystalline compounds.

X-ray fluorescence

X-ray Fluorescence (XRF)

A technique used to determine the elemental composition of a specimen by bombarding the material with x-rays. The x-rays excite the atoms in the specimen causing them to emit x-rays of a longer wavelength. These are detected by the analytical equipment and on the basis of comparison with known standards the elemental composition of the specimen is determined.

xyloid coal

Xyloid Coal

A type of lignite coal that displays the fibrous structure of the wood. Also known as "xyloid lignite".

xyloid coal

Xylopal

An opalized wood. Forms when common opal infills the cavities and replaces the organic material of a piece of wood. Sometimes the wood grain or cellular details of the original wood can be seen..

A     B     C     D     E     F     G     H     I     J     K     L     M     N     O     P     Q     R     S     T     U     V     W     X     Y     Z



Find it on Geology.com




More from Geology.com


Fire Opal
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Green River Formation
The Green River Formation is one of the most famous rock units in the world for its fossils.
Olivine
Olivine is a rock-forming mineral found in the crust, the mantle, and in some meteorites.
Diamonds from Coal
Biggest Misconception: Lots of people think that diamonds form from coal. Not True!
Frac Sand
Frac Sand: The amount of frac sand produced in the USA is up by over 300% since 2009.
caldera
Calderas are enormous volcanic craters formed by some of Earth\'s largest eruptions.
Dallol Volcano
Strange Volcanic Landscape! Photos of Dallol Volcano - an explosion crater in Ethiopia.
Crater of Diamonds
You Can Be A Diamond Miner! At the Crater of Diamonds Mine you keep what you find.



© 2005-2014 Geology.com. All Rights Reserved.
Images, code and content of this website are property of Geology.com. Use without permission is prohibited. Pages on this site are protected by Copyscape.