from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A greenish variety of amphibole.
from The Century Dictionary.
- noun A trade-name of an apparatus by which the ultra-violet rays may be employed in the treatment of cutaneous diseases.
- noun A radiatedmineral, called by Werner strahlstein (ray-stone), consisting of silicates of calcium, magnesium, and iron.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) A bright green variety of amphibole occurring usually in fibrous or columnar masses.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
mineralwith monocliniccrystals of the chemical formula Ca2( Mg, Fe)5 Si8 O22(O H)2, belonging to the amphibolegroup.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a green mineral of the amphibole group; calcium magnesium iron silicate
Sorry, no etymologies found.
In accompanying notes, a geologist identified as W.J. Hunter boasted of a rock formation from the Miocene Epoch that gleamed with boulders of "tourmaline-actinolite-quartz plutonites."
Greenstone, diorite, and actinolite are found, though not so abundantly as those above mentioned.
In particular, the minerals concerned are: chrysotile, amosite, crocidolite, anthophyllite, tremolite und actinolite, which are categorized on the basis of their chemical composition and fibrous structure as serpentine Asbestos
The general character of the rock here is sienitic; but, besides this peculiar quality of feldspar, the hornblende appears as actinolite, (ray-stone,) so called from the form of its crystallization; while the quartz element is faintly present, or appears in separate masses.
_Chalcedony_ too (which when banded furnishes us our _agates_, and when reddish our _carnelian_) is a variety of quartz, and _prase_ is only quartz colored green by fibers of actinolite within it.
These include a dangerous fibrous asbestos as well as the harmless monoclinic amphibole, actinolite: two minerals with the same composition but very different effects on human physiology.
Libby vermiculite is contaminated with an especially toxic form of naturally-occurring asbestos called tremolite-actinolite asbestiform mineral fibers.
The six types of asbestos are chrysotile, crocidolite, amosite, anthophyllite asbestos, tremolite asbestos, and actinolite asbestos.
South - west of this, five miles above Catar6 to the west of the road, and northwest of Mount Basimo, he obtained a dark-colored actinolite slate.
The types amosite, anthopyllite, tremolite and actinolite are quantitatively (together 50 000