Science, Tech, Math › Science 9 Common Green Rocks and Minerals Identification Is Easier When You Know What to Look For Share Flipboard Email Print Science Geology Types Of Rocks Landforms and Geologic Features Geologic Processes Plate Tectonics Chemistry Biology Physics Astronomy Weather & Climate By Andrew Alden Geology Expert B.A., Earth Sciences, University of New Hampshire Andrew Alden is a geologist based in Oakland, California. He works as a research guide for the U.S. Geological Survey. our editorial process Andrew Alden Updated October 08, 2019 Green and greenish rocks get their color from minerals that contain iron or chromium and sometimes manganese. By studying a material's grain, color, and texture, you can easily identify the presence of one of the minerals below. Be sure to examine your sample on a clean surface and pay close attention to the material's luster and hardness. Chlorite This rock contains a large percentage of chlorite, exhibiting its typical green color. James St. John / Flickr / CC BY 2.0 The most widespread green mineral, chlorite is rarely present by itself. In microscopic form, it gives a dull olive green color to a wide range of metamorphic rocks from slate and phyllite to schist. Although it appears to have a flaky structure like mica, chlorite gleams rather than sparkles and doesn't split into flexible sheets. The mineral has a pearly luster. Actinolite Bladed sprays of dark green actinolite are visible in this specimen. ThoughtCo / Andrew Alden Actinolite is a shiny medium-green silicate mineral with long, thin crystals. You'll find it in metamorphic rocks such as marble or greenstone. Its greenish color is derived from iron. Jade is a type of actinolite. A related mineral that contains little or no iron is called tremolite. Epidote Gemmy olive green crystals of epidote. DEA / PHOTO 1 / Getty Images Epidote is common in medium-grade metamorphic rocks as well as igneous rocks that have undergone alteration. It ranges in color from yellow-green to green-black to black, depending on its iron content. Epidote is occasionally used as a gemstone. Glauconite Glauconite. John Krygier / Wikimedia Commons / Public Domain Glauconite is most commonly found in greenish marine sandstones and greensands. It's a mica mineral, but because it forms through the alteration of other micas it never forms crystals. Instead, glauconite typically appears as bands of blue-green within rocks. Because of its relatively high potassium content, it is used in fertilizer as well as in artist paints. Jade (Jadeite/Nephrite) A polished piece of green jade. Christophe Lehenaff / Getty Images Two minerals, jadeite and nephrite, are recognized as true jade. Both occur where serpentinite is found but form at higher pressures and temperatures. Jade typically ranges from pale to deep green, with less common varieties appearing lavender or blue-green. Both forms are commonly used as gemstones. Olivine Peridot, a gem variety of olivine. Scientifica / Getty Images Dark primary igneous rocks (basalt, gabbro, and so on) are typically where olivine is found. The mineral usually occurs as small, clear olive-green grains and stubby crystals. A rock made entirely of olivine is called dunite. Olivine is most commonly found below the Earth's surface. It gives the rock peridotite its name, peridot being the gem variety of olivine. Prehnite Typical botryoidal clusters of bottle-green prehnite crystals. Matteo Chinellato - ChinellatoPhoto / Getty Images Prehnite is a silicate derived from calcium and aluminum. It can frequently be found in botryoidal clusters in pockets along with zeolite minerals. The mineral has a light bottle-green color and is translucent, with a glassy luster. It is sometimes used as a gemstone. Serpentine Serpentine is the green mineral in this rock known as serpentinite. J Brew / Flickr / CC BY-SA 2.0 Serpentine is a metamorphic mineral that occurs in some marbles but is more often found by itself in serpentinite. It typically occurs in shiny, streamlined forms, asbestos fibers being the most notable exception. The mineral's color ranges from white to black but is usually dark olive green. The presence of serpentine is often evidence of prehistoric deep-sea lavas that have been altered by hydrothermal activity. Other Green Minerals Mariposite is a green, chromium-rich variety of mica. Yath / Wikimedia Commons / CC BY-SA 3.0 Several other minerals are also typically green, but they aren't widespread and are quite distinctive. These include dioptase, fuchsite, uvarovite, and variscite. You're more likely to find them in rock shops than in the field.