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Answer for the clue "Altered basaltic rock ", 10 letters:
greenstone

Word definitions for greenstone in dictionaries

Wikipedia Word definitions in Wikipedia
Greenstone is a suite of software tools for building and distributing digital library collections on the Internet or CD-ROM . It is open-source , multilingual software, issued under the terms of the GNU General Public License . Greenstone is produced by ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Greenstone \Green"stone`\ (gr[=e]n"st[=o]n`), n. [So called from a tinge of green in the color.] (Geol.) A name formerly applied rather loosely to certain dark-colored igneous rocks, including diorite, diabase, etc.

Wiktionary Word definitions in Wiktionary
n. 1 (context archaeology English) any of several green-hued minerals used for making various artefacts in early Mesoamerican cultures, e.g. greenschist, chlorastrolite, serpentine, omphacite, or chrysoprase 2 (context New Zealand English) the green-hued ...

Usage examples of greenstone.

The surrounding islands all consist of conical masses of greenstone, associated sometimes with less regular hills of baked and altered clay-slate.

Elizabeth, tearful and broken, had headed directly for the comfort of her Mother, both assum'd into a silent unapproachable cloud of mourning, the boys being left each to his own way of soldiering on, the Enemy who'd so unanswerably insulted them at their Backs now some where, and in and out of their sleep George got busier than he had to be with one Scheme and another, pulling Greenstone out of the Dyke under Cockfield Fell, carving and fitting together stalks of Humlock for another of his Gas-pipe Schemes, re-designing the Spur-gearing or the Pump-seals out at the Workings.

The continents showed up in his images as black and dark islands in glowing oceans, the ancient granite cratons surrounded by crumpled greenstone.

Tabitha was normally very strict about keeping Greenstones in the Hold after dark.

Lydie was the closest thing to a friend she had among the other Greenstones, but there was no way she could talk to Lydie about something like this.

He looked out of the corner of his eye and saw two adolescent Greenstones standing not far away, half-concealed behind a tree-trunk, peering at him with round eyes.

There had not been a prisoner in there for years, and young Greenstones sometimes whispered that those rooms were haunted.

I did not advance to spill the greenstones onto his lap table as I might have done had his attitude been welcoming, but held the best on the palm of my hand in the full light of the room.

Collecting greenstones on the island was illegal but off shore the practice was allowed.