blue stone
Definition
Noun: 1. A hydrated blue crystalline form of copper sulfate: A specific chemical compound, copper(II) sulfate pentahydrate (CuSO₄·5H₂O), characterized by its bright blue color and crystalline structure.
Usage
- Blue stone is a common name used in chemistry, mining, agriculture, and traditional applications for this specific compound.
- It is typically used as an uncountable noun when referring to the substance in bulk (e.g., "a bag of blue stone").
- It can be used as a countable noun when referring to individual crystals or pieces (e.g., "a beautiful blue stone").
Examples
- The chemist added a few grams of blue stone to the solution to test for the presence of water.
- The old recipe for fungicide called for dissolving blue stone in water.
- Miners extracted the vibrant blue stone from the deposit.
- He held up a perfect, geometric blue stone to the light.
Advanced Usage
- Historical/Traditional Use: "Blue stone" was historically used in dyeing, leather tanning, and as an algaecide in ponds and water systems.
- Scientific Context: In precise scientific writing, the terms "copper(II) sulfate pentahydrate" or the mineral name "chalcanthite" are preferred over the common name "blue stone."
Variants and Related Words
- Copper sulfate (noun): The general name for the chemical compound CuSO₄, which can be anhydrous (white) or hydrated (blue).
- Chalcanthite (noun): The mineralogical name for the naturally occurring crystalline form of blue stone.
- Bluestone (noun): Note: This is a distinct, closed compound word. It commonly refers to a type of sandstone or basalt used in construction (e.g., for paving), not to copper sulfate. The two terms should not be confused.
Synonyms
- Copper(II) sulfate pentahydrate
- Cupric sulfate pentahydrate
- Chalcanthite (when referring to the mineral)
Notes on Meaning
The term blue stone specifically and exclusively refers to the hydrated, blue crystalline form of copper sulfate. It does not refer to other blue-colored stones or gems (e.g., lapis lazuli, sapphire). For other blue minerals, descriptive phrases like "a blue stone" or the specific mineral name are used.
Noun
-
hydrated blue crystalline form of copper sulfate
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