actinolite

[ak-tin-l-ahyt, ak-tuh-nl-]

ac·tin·o·lite

[ak-tin-l-ahyt, ak-tuh-nl-]
noun Mineralogy.
a variety of amphibole, occurring in greenish bladed crystals or in masses.

Origin:
1825–35; actino- + -lite

ac·tin·o·lit·ic [ak-tin-l-it-ik, ak-tuh-nl-] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Actinolite is always a great word to know.
So is gobo. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
actinolite (ækˈtɪnəˌlaɪt)
 
n
a green mineral of the amphibole group consisting of calcium magnesium iron silicate. Formula: Ca2(Mg,Fe)5Si8O22(OH)2
 
[C19: from actino- (from the radiating crystals in some forms) + -lite]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
actinolite   (āk-tĭn'ə-līt')  Pronunciation Key 
A greenish variety of amphibole. Actinolite is a monoclinic mineral, and occurs in long, slender, green needlelike crystals, or in fibrous, radiated forms in metamorphic rocks. Chemical formula: Ca2(Mg,Fe)5Si8O22OH2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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