Search results for "Herbert's Rock-wallaby" - New World Encyclopedia
From New World Encyclopedia
- Talc (derived from the Persian via Arabic talq) is a mineral composed of magnesium silicate hydroxide. It is extremely soft, with a greasy feel ...8 KB (1,172 words) - 03:55, 27 February 2023
- Mica is an important group of rock-forming silicate minerals, belonging to the subgroup called phyllosilicates. The group consists of more than ...9 KB (1,317 words) - 16:34, 9 November 2022
- The pyroxenes are a group of important rock-forming silicate minerals found in many igneous and metamorphic rocks. They share a common structure ...9 KB (1,340 words) - 03:53, 7 December 2022
- Once thought of as a single mineral species, lepidolite has been recently redefined as a series of minerals in the mica group. [http://www.mindat ...4 KB (543 words) - 00:47, 7 March 2023
- In the United States, the Presidential library system is a nationwide network of libraries administered by the Office of Presidential Libraries ...19 KB (2,492 words) - 22:38, 30 November 2022
- A rock is a naturally occurring aggregate of minerals and mineral-like substances called mineraloids. Rocks are classified as igneous, sedimentary ...20 KB (3,012 words) - 02:25, 16 December 2022
- Calcite is a carbonate mineral and is among the most widely distributed minerals on the Earth's surface. Chemically, it is known as calcium ...7 KB (1,007 words) - 18:20, 25 November 2023
- Olivine (also called chrysolite) is a name used for a series of minerals that are among the most common on Earth. The gem-quality variety is ...10 KB (1,460 words) - 10:32, 11 March 2023
- Gypsum is a very soft mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widespread in nature and is ...8 KB (1,054 words) - 21:52, 28 July 2023
- The spinels are an important group of oxide minerals with similar crystalline structures. Their general chemical formula may be written as (X ...8 KB (1,173 words) - 15:23, 27 April 2023
- Flint (or flintstone) is a hard, sedimentary, cryptocrystalline form of the mineral quartz, categorized as a variety of chert. It occurs chiefly ...10 KB (1,542 words) - 17:39, 28 March 2024
- Lapis lazuli, also referred to as lapis, is a stone with one of the longest traditions of being considered a gem. Deep blue in color and opaque ...11 KB (1,631 words) - 22:35, 22 October 2022
- Fluorite (also called fluorspar) is a mineral composed of calcium fluoride (chemical formula CaF2). It is present in large deposits in many parts ...8 KB (1,085 words) - 17:48, 28 March 2024
- Zircon is a mineral belonging to a subgroup of silicate minerals called nesosilicates. Chemically, it is known as zirconium silicate, with the ...9 KB (1,181 words) - 06:08, 13 June 2023
- Arches National Park preserves over 2,000 natural sandstone arches—the world's largest concentration—including the world-famous Delicate ...13 KB (1,918 words) - 06:16, 12 August 2023
- Pyrite (or iron pyrite) is the most common of the sulfide minerals. Chemically, it is known as iron disulfide (FeS2). Its metallic luster and ...8 KB (1,190 words) - 21:08, 14 April 2023
- Igneous rocks form when magma (molten rock) cools and solidifies. The solidification process may or may not involve crystallization, and it may ...25 KB (3,680 words) - 13:42, 4 February 2023
- Devils Tower is a monolithic igneous intrusion or volcanic neck located in the Black Hills in northeastern Wyoming (U.S.), above the Belle Fourche ...18 KB (2,711 words) - 10:16, 29 January 2024
- In Islamic eschatology the Mahdi ( ar|مهدي Mahdī , also Mehdi; "Guided One") is the prophesied redeemer of Islam. The advent of ...8 KB (1,342 words) - 05:27, 5 November 2022
- The term jade is applied to two different types of rock, nephrite and jadeitite, that are made up of different silicate minerals. Nephrite can ...12 KB (1,830 words) - 08:35, 18 March 2024
