• Webster's Revised Unabridged Dictionary
    • n Greenstone grēn"stōn` (Geol) A name formerly applied rather loosely to certain dark-colored igneous rocks, including diorite, diabase, etc.
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Century Dictionary and Cyclopedia
    • n greenstone Any one of various rocks, of eruptive origin, in general older than the Tertiary, crystalline-granular in texture, and of a dark-greenish color. The essential ingredients of the rocks formerly classed under the name of greenstone are tri-clinic feldspar and hornblende, with which are associated various other minerals in greater or less quantity, and especially chlorite, mica, magnetite, and apatite. The name is abandoned by some lithologists, but retained by many geologists as a convenient designation for those older eruptive rocks which have undergone so much alteration that their original character is in a measure lost, and cannot be made out except with the aid of the microscope, and not always with that help. The most important of these changes seems to be that the original augite has been converted into hornblende, while a still more advanced stage of alteration is indicated by the presence of chlorite, mica, and other minerals, the predominating color of which is greenish, and to this peculiarity the rock owes its name. While there can be little doubt that many of the so-called greenstones, or melaphyres and diorites, as rocks of this class have of later years been often designated, are altered basalts, there is far from being a general agreement among lithologists as to the proper limitation of these names. See basalt, diorite, melaphyre, trap.
    • n greenstone A very hard and close-textured stone used for putting the last edge on lancets and other delicate surgical instruments, etc.
    • n greenstone A name in New Zealand for several varieties of jade, specifically for pounamu or nephrite, found chiefly on the west coast of the Middle Island: formerly much used by the Maoris for weapons, implements, and ornaments.
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Chambers's Twentieth Century Dictionary
    • Greenstone a rock term, now disused, for any dark-green basic crystalline (trap-rock)
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Webster's Revised Unabridged Dictionary
So called from a tinge of green in the color
Chambers's Twentieth Century Dictionary
A.S. gréne; Ger. grün, Dut. groen, green, Ice. grænn, allied to grow.


In literature:

There are many specimens of half-formed pumice, with greenstone and lava.
"Missionary Travels and Researches in South Africa" by David Livingstone
The western coast generally consists of low, rounded, quite barren hills of granite and greenstone.
"A Naturalist's Voyage Round the World" by Charles Darwin
The green edging of the lamp-shade became like Maori greenstone rather than emerald.
"The Jewel of Seven Stars" by Bram Stoker
There was also a very large stone tomahawk made of greenstone; and some fans of emu feathers.
"Journal of an Overland Expedition in Australia" by Ludwig Leichhardt
They consist of fragments of granite, syenite and greenstone, as well as of Devonian and Silurian rocks, some of them of large size.
"The Geological Evidence of The Antiquity of Man" by Charles Lyell
Holman took the long greenstone knife, and we crept quietly away in the direction taken by Kaipi.
"The White Waterfall" by James Francis Dwyer
Indistinct specimens of greenstone, with adhering quartz; apparently a primitive rock.
"Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]" by Phillip Parker King
The Soviet Government," he went on, "must have known that we had something 'way back when they signed the Greenston Agreement.
"Hail to the Chief" by Gordon Randall Garrett
The rocks of which greenstone and trap are types, are found very largely scattered over the country.
"Manures and the principles of manuring" by Charles Morton Aikman
Popular names for them are "whinstone," "greenstone," "toadstone" and "trap.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3" by Various
Many large boulders of greenstone were seen here.
"Narrative of a Second Expedition to the Shores of the Polar Sea" by John Franklin
A kind of basalt or greenstone, composed wholly or principally of granular augite.
"A Manual of Elementary Geology" by Charles Lyell
In syenite and greenstone it occurs more commonly than orthoclase.
"Geology" by James Geikie
The 'greenstones' of older authors are mostly diorites.
"The New Gresham Encyclopedia" by Various
The rock in connection is greenstone trap, which is sometimes porphyritic.
"Scenes and Adventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas" by Henry Rowe Schoolcraft
Cyclopean columns of greenstone crown a talus always heavy on the Antrim cliffs, owing to their friable nature.
"Climbing in The British Isles, Vol. II" by W. P. Haskett Smith
Its geological structure is, however, different: the rocks are greenstone, or granite, without slate.
"Narrative of the surveying voyages of His Majesty's ships Adventure and Beagle, between the years 1826 and 1836" by Robert FitzRoy
Trap and greenstone constitute prominent tracts, and exist in the condition of dykes in the syenite, or feldspathique granite.
"The American Indians" by Henry R. Schoolcraft
Trap and greenstone constitute prominent tracts, and exist in the condition of dykes in the syenite, or feldspathique granite.
"Western Scenes and Reminiscences" by Henry Rowe Schoolcraft
Near Knaas river the formation in the valley is a conglomerate of limestone, greenstone, and garnets.
"Twenty-Five Years in a Waggon in South Africa" by Andrew A. Anderson

In news:

Leonard Greenstone dies at 88.
Established in 1993 under The Upjohn Company in Kalamazoo, Michigan, Greenstone LLC is a generic pharmaceutical subsidiary of Pfizer Inc (NYSE: PFE), the world's leading biopharmaceutical company.
Greenstone LLC has added montelukast sodium tablets and chewable tablets to its roster of generic pharmaceuticals.
Greenstone , generic Singulair, montelukast sodium tablets, generic pharmaceuticals, Pfizer, Merck, generic equivalent.
Greenstone , the generic pharmaceutical subsidiary of Pfizer, has launched olanzapine tablets.
View full size Courtesy of Wayne Greenstone Former Essex County Freeholder Reita Greenstone , who later remarried and went by the last name Davis, died Sunday at age 86.
Brook Walsh Of GreenStone Farm Credit Services.
Judith Greenstone Miller of Jaffe Raitt Heuer & Weiss, P.C.
Pfizer was expected to introduce a deeply discounted generic version of its brand name antidepressant Zoloft through its Greenstone division after the drug lost patent protection on June 30.
Patrina Names KPC Greenstone /Roberts to Account.
30 pm, someone reported their 1999 Dodge pickup stolen from the 3500 block of Greenstone Place after accidentally leaving the keys inside, said Redding Police Cpl.