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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

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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

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Earth and Space Sciences · 术语表

什么是 Polymorph？

Definition 21.4 High School Earth and Space Sciences · 第 21 章 — Metamorphic Rocks

Two minerals are polymorphs when they have the same chemical composition but different crystal structures: the same atoms, arranged differently.

The fields of the three polymorphs of Al2SiO5, with pressure increasing downwards like depth (right-hand scale, for a crust of density 2830\, kg/ m3). Black lines: the boundaries measured in the laboratory; the three meet at the triple point (black dot), 504\, C and 0.375\, GPa. Dashed: three geotherms, starting from 10\, C at the surface; the circles mark where they cross a boundary. — The fields of the three polymorphs of $\ce{Al2SiO5}$ , with pressure increasing downwards like depth (right-hand scale, for a crust of density $2830\,\mathrm{kg}/\mathrm{m}^{3}$ ). Black lines: the boundaries measured in the laboratory; the three meet at the triple point (black dot), $504\,{}^{\circ}\mathrm{C}$ and $0.375\,\mathrm{GPa}$ . Dashed: three geotherms, starting from $10\,{}^{\circ}\mathrm{C}$ at the surface; the circles mark where they cross a boundary.

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Definition 7.2 University Earth and Space Sciences — Year 1 · 第 7 章 — Rock-Forming Minerals

Two minerals are polymorphs of each other when they have the same chemical composition and different crystal structures.

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