blue stone

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A student carefully places a blue stone into a glass beaker of clear liquid.

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.

A student carefully places a blue stone into a glass beaker of clear liquid.

Noun

hydrated blue crystalline form of copper sulfate

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Từ chứa "blue stone"

bluestone