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Garnierite is a green mineral, ranging from light yellow-green to dark green. [3] [5] The color comes from the presence of nickel in the mineral structure for magnesium. [4] Noumeaite (later determined to be a member of the garnierite family) varies in hardness, from soft and brittle to hard enough to carve into figurines and the like. [11]
Associated minerals include metavivianite, ludlamite, pyrite, siderite and pyrrhotite. [2] [11] Hydrothermal veins produce the best crystal specimens with the classic gemmy green color. [11] The type locality is Wheal Kind (Wheal Kine), West Wheal Kitty group, St Agnes, St Agnes District, Cornwall, England. [3]
Antlerite is a greenish hydrous copper sulfate mineral, with the formula Cu 3 (SO 4)(OH) 4.It occurs in tabular, acicular, or fibrous crystals with a vitreous luster. Originally believed to be a rare mineral, antlerite was found to be the primary ore of the oxidised zones in several copper mines across the world, including the Chuquicamata mine in Chile, and the Antler mine in Arizona, US from ...
The bright green, lustrous antigorite richly covering this specimen has an unusual knobby/bubbly/drusy form. Bowenite (Antigorite) from Asbestos mine, Thurman Township, Warren County, New York, US Polished slab of bowenite serpentine, a variety of antigorite.
White veins in dark rock at Imperia, Italy. In geology, a vein is a distinct sheetlike body of crystallized minerals within a rock. Veins form when mineral constituents carried by an aqueous solution within the rock mass are deposited through precipitation. The hydraulic flow involved is usually due to hydrothermal circulation. [1]
Roscoelite is a green mineral from the mica group that contains vanadium. The chemical formula is K(V 3+, Al, Mg) 2 Al Si 3 O 10 (OH) 2. [2] Crystals of roscoelite take on the monoclinic form, and are from the 2/m point group. The appearance is semi transparent to translucent coloured olive brown to green brown. The lustre is pearly.
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Greenalite was first described in 1903 for an occurrence in the Mesabi Range near Biwabik, St. Louis County, Minnesota and named for its green color. [3] Greenalite occurs as a primary mineral in banded iron formations. Rocks which contain greenalite are usually bright green, pale green or pale brown.