How do you care for limestone?

It rates 3 to 4 (aggregate) on the Mohs scale. Clean it with warm water and a soft cloth, and keep it out of ultrasonic tanks and steamers.

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A stone guide

Limestone

Q: What is often mistaken for limestone?

Marble. Marble is recrystallized, sugary sparkle, no fossils; limestone is dull and often fossiliferous.

Most limestone is biological, compacted shells, coral, and plankton; you can often see the sea creatures it's made of.

Sedimentary (carbonate)See originsSee treatment disclosure

Limestone is sedimentary (carbonate), (mostly CaCO₃). In the hand, it rates 3 to 4 (aggregate) on the Mohs scale, and it runs gray and tan. Soft gray-to-cream sedimentary stone that fizzes enthusiastically in vinegar and often carries visible shell fossils. Worldwide, former seafloors; from the white cliffs of Dover to the stone of the Great Pyramids.

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Sedimentary (carbonate)

Mohs

3 to 4 (aggregate)

Luster

Dull to earthy

Gravity

2.3 to 2.7

Light

Opaque

What it is

The geology.

Limestone carries the formula (mostly CaCO₃). It has no single crystal system. It is classed as sedimentary (carbonate).

It sits at 3 to 4 (aggregate) on the Mohs scale. The surface reads dull to earthy. Light behavior is opaque. Specific gravity runs 2.3 to 2.7. The streak is white. It breaks with uneven fracture.

Soft gray-to-cream sedimentary stone that fizzes enthusiastically in vinegar and often carries visible shell fossils.

It turns up mostly as building stone, fossil slabs, septarian host or tumbled.

Where it comes from

The origins.

Worldwide, former seafloors; from the white cliffs of Dover to the stone of the Great Pyramids.

On value, the database notes: common and very affordable.

What people work with it for

Traditional associations.

In energy work traditions, associated with foundations and accumulation of experience.

This is lore, and we label it as lore. The measurable facts are further up the page.

What to look for

Spotting the real thing.

Soft gray-to-cream sedimentary stone that fizzes enthusiastically in vinegar and often carries visible shell fossils.

Looks like	How to tell them apart
Marble	Marble is recrystallized, sugary sparkle, no fossils; limestone is dull and often fossiliferous
Sandstone	Sandstone is gritty and never fizzes
Howlite	Howlite doesn't fizz in cold vinegar

Check it yourself

At-home tests.

A loupe and a window seat settle most questions about limestone. No workshop required.

Test	What you should see
Acid check	Vigorous fizz with vinegar
Scratch check	Knife scratches easily
By eye	Look for shell and crinoid fragments

Destructive tests belong to a gemologist, not a kitchen table. If a piece matters to you, pay for an appraisal before you take a file to it.

How to live with it

Care & handling.

At 3 to 4 (aggregate) on the Mohs scale this is a soft material. Keep it as a display piece, store it apart from harder stones, and skip daily-wear settings.

It breaks with uneven fracture, which is worth knowing before you set it or drop it.

Clean it by hand, dry it properly, and keep it away from ultrasonic cleaners and hot steam.

Pairs well with.

For the serious reader

A deeper look.

Extended detail on composition, sourcing, authentication and market value.

The physical record

The formula on record is (mostly CaCO₃). Crystal system: not applicable. Specific gravity: 2.3 to 2.7. Streak: White. Cleavage and fracture: Uneven fracture.

How it reaches the market

Worldwide, former seafloors; from the white cliffs of Dover to the stone of the Great Pyramids.

What it gets confused with

Marble: Marble is recrystallized, sugary sparkle, no fossils; limestone is dull and often fossiliferous. Sandstone: Sandstone is gritty and never fizzes. Howlite: Howlite doesn't fizz in cold vinegar.

What it is worth

Common and very affordable.

One more thing

Most limestone is biological, compacted shells, coral, and plankton; you can often see the sea creatures it's made of.

From the Beyond Bohemian library

An education-first guide.

We publish this guide from our research and years of experience with crystals, so you can understand this stone wherever you find it.

Explore the Crystal Guide

Limestone

Love Limestone? Meet Jasper.

The geology.

The origins.

Traditional associations.

Spotting the real thing.

At-home tests.

Care & handling.

Pairs well with.

A deeper look.

The physical record

How it reaches the market

What it gets confused with

What it is worth

One more thing

An education-first guide.

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Limestone

The geology.

The origins.

Traditional associations.

Spotting the real thing.

At-home tests.

Care & handling.

Pairs well with.

A deeper look.

The physical record

How it reaches the market

What it gets confused with

What it is worth

One more thing

An education-first guide.

Most items are one of one or come in limited batches. See them, and the stories behind them, before anyone else.