| 词条 | Hexagonite |
| 释义 |
| name = Hexagonite | boxwidth = | boxbgcolor = | image = File:Tremolite-172420.jpg | imagesize = | alt = | caption = | category = mineral variety of tremolite | formula = Ca2Mg5 (Si8O22) (OH)2 | symmetry = monoclinic – prismatic | unit cell = | molweight = | color = red to pink, lilac to purple | habit = elongated, bladed crystals, granula | system = | twinning = simple, multiple | cleavage = [110] perfect; [010] distinct | fracture = uneven | tenacity = brittle | mohs = 5.0–6.0 | luster = vitreous | streak = | diaphaneity = | gravity = | density = | polish = | opticalprop = | refractive = 1.599–1.637 biaxial ( - ) | birefringence = 0.019–0.028 | pleochroism = bluish–red, deep rose, deep red–violet | 2V = | dispersion = weak, r < v | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = }} Hexagonite is the red to pink, lilac to purple manganoan variety of tremolite. A rare amphibole, it can be transparent, translucent, and rarely opaque. PropertiesHexagonite is pleochroic, potentially displaying varying shades of blue, violet, purple, or red.[1] It is also known as "mangan-tremolite", since the manganese imparts the mineral's unique colors.{{Citation needed|date=August 2016}} Pink, lilac, and purple are the most common colors.[1] Hexagonite has been successfully faceted.[1] Chemical formulae and historyTremolite was discovered in 1789.[2] Hexagonite, a varietal form of tremolite, has a Mohs hardness of 5.0-6.0.[5] Like tremolite, it is a calcium magnesium silicate hydroxide with the formula: Ca2Mg5 (Si8O22) (OH)2.[3] The mineral was given the name, hexagonite, because its crystal structure was believed at one time to be hexagonal. Since then, however, it has been found to be monoclinic.[3] OccurrenceThe mineral is found primarily in the Balmat-Edwards zinc district of Edwards, St. Lawrence County, New York, United States.[4] It was also found in the Czech Republic in the Chýnov caves.[5] References1. ^1 2 Hexagonite Gemstone Information; Gem Data website; accessed August 2016 {{mineral-stub}}2. ^Tremolite on Mindat.org 3. ^1 2 Hexagonite on Mindat.org 4. ^Balmat Hexagonite; article; July 27, 2015; Fred Haynes blog; "WCGMC Activity;" accessed Aug 2017 5. ^Litochleb J, Sejkora J (2007) Occurrence of tremolite-hexagonite in dolomite marbles in the Chýnov cave (southern Bohemia). Minerál 15: 124-126 (in Czech) 1 : Minerals |
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