phương giải
Definition
- Noun:
- Calcite: A common, naturally occurring crystalline form of calcium carbonate (CaCO₃). It is a major constituent of sedimentary rocks like limestone and metamorphic rocks like marble, and is the primary mineral in many shells and pearls.
- A type of mineral: Characterized by its perfect cleavage in three directions, forming rhombohedra, and its reaction with dilute hydrochloric acid, causing effervescence.
Usage Examples
- Noun:
- Phương giải là khoáng vật phổ biến trong đá vôi. (Calcite is a common mineral in limestone.)
- Mẫu phương giải này có độ trong suốt rất đẹp. (This specimen of calcite has a beautiful transparency.)
- Canxit, hay còn gọi là phương giải, có công thức hóa học là CaCO₃. (Calcite, also known as phương giải, has the chemical formula CaCO₃.)
Advanced Usage
- In geology and mineralogy, "phương giải" specifically refers to the mineral species calcite, distinguishing it from other carbonate minerals like aragonite (which has the same composition but a different crystal structure).
- Phương giải và aragonit là hai dạng thù hình của canxi cacbonat. (Calcite and aragonite are two polymorphs of calcium carbonate.)
Variants and Related Words
- Canxit: The direct loanword and more common scientific term in Vietnamese for "calcite". It is synonymous with .
- Đá vôi (n): Limestone, a sedimentary rock composed largely of calcite.
- Đá cẩm thạch / Marble (n): A metamorphic rock formed from recrystallized calcite or dolomite.
Synonyms
- Calcite: The direct English equivalent and most precise term.
- Calcium carbonate (crystalline): Describes its chemical composition and form.
Notes on Usage
- The word "phương giải" is a specialized geological/mineralogical term derived from Sino-Vietnamese roots. In modern scientific and common usage, the loanword "canxit" is more frequently used.
- It is important not to confuse (calcite) with (gypsum), which is calcium sulfate.