全部书籍

1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

1 Primary & Middle School Physics1–9 年级在线 2 High School Physics10–12 年级在线 3 University Physics — Year 1本科一年级在线 4 University Physics — Year 2本科二年级在线 5 University Physics — Year 3本科三年级在线

1 School Chemistry — Grades 1 to 121–12 年级在线 2 University Chemistry — Year 1本科一年级在线 3 University Chemistry — Year 2本科二年级在线 4 University Chemistry — Year 3本科三年级在线

1 Primary & Middle School Biology1–9 年级在线 2 High School Biology10–12 年级在线 3 University Biology — Year 1本科一年级在线 4 University Biology — Year 2本科二年级在线 5 University Biology — Year 3本科三年级在线

1 Primary & Middle School Earth and Space Sciences1–9 年级在线 2 High School Earth and Space Sciences10–12 年级在线 3 University Earth and Space Sciences — Year 1本科一年级在线 4 University Earth and Space Sciences — Year 2本科二年级在线 5 University Earth and Space Sciences — Year 3本科三年级在线

1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

全部游戏 Math Fuse Word Reactor Atlas Dash

应用关于

Coach

English Français Español Nederlands Português हिन्दी العربية Bahasa Indonesia 简体中文 বাংলা

登录开始阅读

书籍暂未推出简体中文版——当前显示英文版。

Earth and Space Sciences · 术语表

什么是 The main mineral groups？

又称： olivine · garnet · pyroxene · amphibole · mica · feldspar · plagioclase · alkali feldspar

Definition 7.10 University Earth and Space Sciences — Year 1 · 第 7 章 — Rock-Forming Minerals

Olivine is the nesosilicate solid solution $\ce{(Mg,Fe)2SiO4}$ . Garnet is a group of cubic nesosilicates $\mathrm{X_3Y_2(SiO_4)_3}$ , X a divalent ion (Mg, Fe, Mn, Ca), Y a trivalent one (Al, Fe, Cr). A pyroxene is a single-chain inosilicate $\mathrm{XYSi_2O_6}$ ; an amphibole is a double-chain inosilicate with hydroxyl, of about $\mathrm{A_{0-1}X_2Y_5(Si,Al)_8O_{22}(OH)_2}$ . A mica is a sheet silicate with a potassium ion between the sheets, such as muscovite $\ce{KAl2(Si3Al)O10(OH)2}$ and biotite $\ce{K(Mg,Fe)3(Si3Al)O10(OH)2}$ . A feldspar is an aluminium framework silicate of sodium, potassium or calcium. The plagioclase feldspars form the solid solution albite $\ce{NaAlSi3O8}$ – anorthite $\ce{CaAl2Si2O8}$ ; the alkali feldspars lie between albite and orthoclase $\ce{KAlSi3O8}$ .

group	end-members or example	class	density ( $\mathrm{g}\,\mathrm{cm}^{-3}$ )	hardness	cleavage
olivine	forsterite $\ce{Mg2SiO4}$ – fayalite $\ce{Fe2SiO4}$	neso	3.28–4.39	6.5–7	imperfect; conchoidal fracture
garnet	almandine $\ce{Fe3Al2(SiO4)3}$ ; pyrope $\ce{Mg3Al2(SiO4)3}$	neso	4.32; 3.74	7–7.5	none
pyroxene	diopside $\ce{CaMgSi2O6}$ ; enstatite $\ce{Mg2Si2O6}$	ino, single chain	3.22–3.38; 3.2	5.5–6.5	two, at about $87{}^{\circ}$ and $93{}^{\circ}$
amphibole	hornblende $\ce{Ca2(Mg,Fe)4Al(Si7Al)O22(OH)2}$	ino, double chain	3.10–3.28	5–6	two, at $56{}^{\circ}$ and $124{}^{\circ}$
mica	muscovite $\ce{KAl2(Si3Al)O10(OH)2}$ ; biotite $\ce{K(Mg,Fe)3(Si3Al)O10(OH)2}$	phyllo	2.77–2.88; 2.7–3.3	2.5–3	one, perfect: thin flakes
feldspar	albite $\ce{NaAlSi3O8}$ ; anorthite $\ce{CaAl2Si2O8}$ ; orthoclase $\ce{KAlSi3O8}$	tecto	2.55–2.76	6–6.5	two good, {001} and {010}
quartz	$\ce{SiO2}$	tecto	2.65	7	none; conchoidal fracture
carbonates	calcite $\ce{CaCO3}$ ; dolomite $\ce{CaMg(CO3)2}$	—	2.71; 2.84	3; 3.5–4	three, rhombohedral
iron oxide	magnetite $\ce{Fe3O4}$	—	5.18	5.5–6.5	none; strongly magnetic

Table 7.1. The main rock-forming minerals: formulas of the end-members or of a common member, structural class, measured density and hardness on the Mohs scale. Ranges are those of the end-members or of natural samples.

在原文中阅读 →