| 词条 | Aurichalcite |
| 释义 |
| name = Aurichalcite | category = Carbonate mineral | boxwidth = | boxbgcolor = | image = Aurichalcite-Calcite-aur08b.jpg | imagesize = 260px | alt = | caption = | formula = (Zn,Cu)5[(OH)3|CO3]2 | strunz = 5.BA.15 | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/m | unit cell = a = 13.82, b = 6.419 c = 5.29 [Å] β = 101.04°; Z = 2 | color = Pale green, greenish blue, sky-blue; colorless to pale blue, pale green in transmitted light | habit = Typically in tufted divergent sprays or spherical aggregates, may be in thick crusts; rarely columnar, laminated or granular | twinning = Observed in X-ray patterns | cleavage = {010} and {100} Perfect | fracture = Uneven | mohs = 2 | luster = Pearly, silky | refractive = nα = 1.655 nβ = 1.740 nγ = 1.744 | opticalprop = Biaxial (-) | birefringence = 0.0890 | pleochroism = Weak colorless to pale green | 2V = Measured: 1° to 4°, Calculated: 22° | streak = Light blue | gravity = 3.96 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent | other = | references = [1][2][3] }}Aurichalcite is a carbonate mineral, usually found as a secondary mineral in copper and zinc deposits. Its chemical formula is (Zn,Cu)5(CO3)2(OH)6. The zinc to copper ratio is about 5:4.[2] OccurrenceAurichalcite typically occurs in the oxidized zone of copper and zinc deposits. Associated minerals include: rosasite, smithsonite, hemimorphite, hydrozincite, malachite and azurite.[1] It was first described in 1839 by Bottger who named the mineral for its zinc and copper content after the Greek όρειχαλκος, for "mountain brass" or "mountain copper", the name of a fabulous metal. The type locality is the Loktevskoye Mine, Upper Loktevka River, Rudnyi Altai, Altaiskii Krai, Western Siberia, Russia.[2] CrystallographyAurichalcite displays prismatic crystals often in the form of encrustations and sometimes columnar structures.[4] The crystal system is monoclinic. References1. ^1 Handbook of Mineralogy {{-}}{{commons}}2. ^1 2 Mindat 3. ^Webmineral data 4. ^"Aurichalcite Mineral Data." https://www.mindat.org/min-422.html Accessed 18 February 2019. 4 : Copper minerals|Zinc minerals|Carbonate minerals|Monoclinic minerals |
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