Wiki User Answered . Chemical formula for hornblende mineral? Vein Paragenesis and Mineral Chemistry. Extensive solid solution occurs, and each end-member has iron-rich equivalents; minor elements, including manganese, titanium, chromium, potassium, fluorine, and yttrium, are usually present. Hornblende Minerals. Hornblende is a common constituent of many igneous and metamorphic rocks such as granite, syenite, diorite, gabbro basalt, andesite, gneiss and schist.It is the principal mineral of amphibolites.Very dark brown to black hornblendes that contain titanium are ordinarily called basaltic hornblende, from the fact that they are usually a constituent of basalt and related rocks. Connection: Linkedin, Video: Youtube, Research: Researchgate, Work: UAB, Twitter: docfossil Its cleavage angles are at 56 and 124 degrees. , Hornblende crystal (dark green) about 35 mm long, with apatite (white), https://geology.com/minerals/hornblende.shtml, https://en.wikipedia.org/w/index.php?title=Hornblende&oldid=989239266, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License. Answer. Metamorphic rocks with abundant hornblende are called amphibolites. Some members have potassium, titanium, and fluoride. Hornblende is a field and classroom name used for a group of dark-colored amphibole minerals found in many types of igneous and metamorphic rocks. Let us know if you have suggestions to improve this article (requires login). Premium Membership is now 50% off! Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... …of the most common amphibole, hornblende, in the presence of a plagioclase feldspar and garnet. Very dark brown to black hornblendes that contain titanium are ordinarily called basaltic hornblende, from the fact that they are usually a constituent of basalt and related rocks. Our editors will review what you’ve submitted and determine whether to revise the article. 3 4 5. For detailed physical properties of hornblende, see amphibole (table). Updates? (1993) A Metaturbidite-hosted Lode Gold Deposit: The Beaver Dam Deposit, Nova Scotia. Asked by Wiki User. Pargasite occurs in high-grade metamorphic rocks that tend to have more aluminum. British Dictionary definitions for hornblende hornblende noun a black or greenish-black mineral of the amphibole group, found in igneous and metamorphic rocks. Hornblendes exhibit typical amphibole structures; these are based on double tetrahedral chains between which four metal sites are located. A generalized composition for the hornblende group is shown below. 1. Ferro-hornblende mineral data, information about Ferro-hornblende, its properties and worldwide locations. Victoria Co. ⓘ McMillan Brook; Chatterjee, A.K. Chemical Formula: General Formula: Ca 2 (Mg,Fe 2+,Fe 3+,Al) 5 (Si,Al) 8 O 22 (OH) 2 Magnesio-hornblende: Ca 2 Mg 3,(Al,Fe)Si 7 AlO 22 (OH) 2 Ferro-hornblende: Ca 2 Fe 2+ 4,(Al,Fe)Si 7 AlO 22 (OH) 2: Composition: Complex basic silicate of sodium, calcium, magnesium, and aluminum. Hornblende includes following series: magnesiohornblende-ferrohornblende, tschermakite-ferrotschermakite, edenite-ferroedenite, pargasite-ferropargasite, and magnesiohastingsite-hastingsite. It is the principal mineral of amphibolites. [Ferro-hornblende] Kontak, D.J. The four end-members and the cation content of their respective compositions are as follows: hornblende, Ca 2 (Mg 4 Al) (Si 7 Al); tschermakite, Ca 2 (Mg 3 Al 2 ) (Si 6 Al 2 ); edenite, NaCa 2 (Mg) 5 (Si 7 Al); pargasite, NaCa 2 (Mg 4 Al) … Top Answer. Hornblende is the result of two main substitutions starting from tremolite: Si 4+ + (Mg 2+,Fe 2+) ↔ 2Al 3+, and Si 4+ + ↔ A-site ↔ Al 3+ + (Na +,K +). 2009-04-07 12:01:33 2009-04-07 12:01:33 (Ca,Na)2-3(Mg,Fe,Al)5Si8022(OH)2. Variable Formula Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Hornblende has a hardness of 5–6, a specific gravity of 2.9–3.4 and is typically an opaque green, greenish-brown, brown or black color. Other minerals in the hornblende series include: The word hornblende is derived from the German horn and blenden, to 'deceive' in allusion to its similarity in appearance to metal-bearing ore minerals. Hornblende occurs widely in metamorphic and igneous rocks. A small list of the hornblende minerals is given below with their chemical compositions. Its cleavage angles are at 56 and 124 degrees. These minerals vary in chemical composition but are all double-chain inosilicates with very similar physical properties. Chemical Classification: Silicate mineral: General Formula (Ca,Na)2–3(Mg,Fe,Al)5(Al,Si)8O22(OH,F)2. Hornblende is a complex inosilicate series of minerals (ferrohornblende – magnesiohornblende). The rocks are normally highly foliated or schistose. Many zones or isograds subdividing the facies have been recognized, and classic studies have been made in the Highlands of Scotland, New Hampshire and Vermont in the…. Hornblende alters easily to chlorite and epidote. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Formula: Ca 2 (Fe 2+ 4 Al)(Si 7 Al)O 22 (OH) 2.
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