| 词条 | Devilline | |||||||||||||||||||||
| 释义 |
| name = Devilline | category = Sulfate minerals | image = Devilline-t08-23b.jpg | caption = Devilline | formula = CaCu4(SO4)2(OH)6·3(H2O) | molweight = | strunz = 7.DD.30 | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/c | unit cell = a = 20.870, b = 6.135 c = 22.91 [Å], β = 102.73° V = 2,861.23 Å3 | color = green, blueish green; green in transmitted light | habit = prismatic, lamellar, platy pseudohexagonal crystals | twinning = On {010} | cleavage = perfect (001) distinct (110) and (101) | fracture = | tenacity = Brittle | mohs = 2.5 | luster = vitreous, pearly | refractive = nα=1.585, nβ=1.649, nγ=1.660 | opticalprop = biaxial negative | 2V = 42° | birefringence = δ=0.075 | pleochroism = visible | streak = light green | gravity = | density = measured- 3.13 g/cm3 calculated- 3.084 g/cm3 | melt = | fusibility = | diagnostic = | solubility = Insoluble in water and concentrated H2SO4. Completely soluble in HNO3. | diaphaneity = | other = | references = [1][2] }} Devilline is a sulfate mineral with the chemical formula CaCu4(SO4)2(OH)6•3H2O. The name originates from the French chemist's name, Henri Etienne Sainte-Claire Deville (1818–1881). Devilline crystallizes in the monoclinic system.[3] Crystallographically, it contains three vectors of unequal lengths and two pairs of vectors are perpendicular while the other pair makes an angle other than 90°. Devilline is prismatic and belongs to the crystal class 2/m. This mineral belongs to the space group P 21/c. Devilline is an anisotropic mineral, meaning that the mineral has different properties in different directions. Optically, this mineral is biaxial negative, meaning that it contains two optic axes. Devilline has a moderate mineral relief. Mineral relief refers to the way a mineral appears to stand out when viewed under polarized light and it is dependent on the mineral's index of refraction. Devilline is a rare and unusual secondary mineral found in the oxidized portions of copper sulfide ore deposits.[4] Because Devilline occurs in such oxidation zones, this mineral often is of post-mining origin. Devilline is found in mines all around the world. Devilline groupDevilline group minerals are monoclinic sulfates.[5]
References1. ^http://www.mindat.org/min-1270.html {{sulfate-mineral-stub}}2. ^http://webmineral.com/data/Devilline.shtml 3. ^Back, M., and Mandrine, J. (2008) Fleischer's Glossary of Mineral Species 2008. 58 p. Mineralogical Record, Tuscan, Arizona 4. ^http://www.handbookofmineralogy.org/pdfs/devilline.pdf 5. ^{{Cite book |first1=Malcolm E. |last1=Back |title=Fleischer’s Glossary of Mineral Species |year=2014 |edition=11 |publisher=Mineralogical Record Inc. |pages=434 |location=Tucson AZ}} 4 : Calcium minerals|Copper minerals|Sulfate minerals|Monoclinic minerals |
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