| 词条 | Cronstedtite |
| 释义 |
| name = Cronstedtite | boxwidth = | boxbgcolor = | image = Cronstedite France.jpg | imagesize = 260px | alt = | caption = Cronstedtite - Salsigne Mine - France | category = Silicate minerals | formula = Fe2+2Fe3+(Si,Fe3+O5)(OH)4 | molweight = | strunz = 9.ED.15 | dana = | system = Trigonal | class = Ditrigonal pyramidal (3m) (same H-M symbol) | symmetry = P31m | unit cell = a = 5.486 Å, c = 7.095 Å; Z = 1[1] | color = Black, dark brown-black, green-black | colour = | habit = | twinning = | cleavage = Perfect on {001} | fracture = | tenacity = Elastic | mohs = | luster = Sub-Metallic | streak = Dark olive green | diaphaneity = Translucent | gravity = 3.34 - 3.35 | density = | polish = | opticalprop = Biaxial (-) | refractive = nα = 1.720 nβ = 1.800 nγ = 1.800 | birefringence = δ = 0.080 | pleochroism = Visible | 2V = | dispersion = r < v moderate | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = [1][2][3] }} Cronstedtite is a complex iron silicate mineral belonging to the serpentine group of minerals. It has a formula of Fe2+2Fe3+(Si,Fe3+O5)(OH)4. It was discovered in 1821 and named in honor of Swedish mineralogist Axel Fredrik Cronstedt (1722–1765). It has been found in Bohemia in the Czech Republic and in Cornwall, England. Cronstedtite is a major constituent of CM chondrites, a carbonaceous chondrite group exhibiting varying degrees of aqueous alteration. Cronstedtite abundance decreases with increasing alteration.[4] References{{commons category|Cronstedtite}}1. ^1 Webmineral.com {{Refbegin}}{{Refend}}{{silicate-mineral-stub}}2. ^Mindat.org 3. ^American Mineralogical Society 4. ^Browning et al. (1996) Geochimica et Cosmochimica Acta 3 : Iron minerals|Serpentine group|Monoclinic minerals |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。