Diatomaceous Earth: The Extraordinary Legacy of Microscopic Life

What if we told you that a fine, powdery ingredient could be made from the remains of billions of microscopic organisms that lived in ancient lakes and oceans?

It sounds like something from a science fiction novel, doesn't it? Well that's exactly the story behind diatomaceous earth.

Unlike bentonite clay, which originates from ancient volcanic material, diatomaceous earth owes its existence to tiny aquatic organisms called diatoms.

These extraordinary forms of microscopic life have been building intricate structures from silica for millions of years.

And when they die, those structures can remain behind, eventually accumulating into vast natural deposits.

The result is a fascinating earth-derived material with an unusual structure, a remarkable history and an extraordinary range of uses.

What Exactly Is Diatomaceous Earth?

Diatomaceous earth, sometimes called diatomite or fossil shell flour, is a naturally occurring, silica-rich sedimentary material formed primarily from the accumulated remains of diatoms.

Diatoms are microscopic, single-celled algae found in freshwater and marine environments around the world.

And here's where things get interesting.

Unlike many other microscopic organisms, diatoms surround themselves with an intricate outer shell made largely from silica.

This shell is called a frustule.

When diatoms die, their organic material decomposes, but their mineral structures can remain.

Over enormous periods of geological time, these tiny silica shells accumulate on lakebeds and ocean floors, forming deposits that may eventually become diatomaceous earth.

It's rather extraordinary to think that something so small can leave behind such an enormous geological legacy.

Nature's Microscopic Architects

If you've ever seen diatoms under a microscope, you'll understand why scientists find them so fascinating.

Their shells aren't simply round or shapeless. They can resemble tiny discs, cylinders, delicate feathers, intricate geometric patterns and even miniature works of architectural art. Many have beautifully arranged pores, ridges and repeating patterns. These aren't decorative features added by humans. They're structures created naturally by living organisms.

Diatoms take up dissolved silica from their aquatic environment and use it to construct their remarkable shells.

Each species produces its own characteristic design.

Some are beautifully symmetrical, while others have elongated or more elaborate shapes.

Imagine an entire microscopic world filled with intricate glass-like structures, each one created by a single living cell.

Nature really is an extraordinary designer.

How Do Diatoms Become Diatomaceous Earth?

The transformation from living organism to natural mineral deposit is a story that unfolds over immense periods of time.

Diatoms live and reproduce in lakes, rivers, oceans and other aquatic environments. As individual diatoms die, some of their silica shells sink towards the bottom. Where conditions are favourable, enormous quantities of these structures accumulate in layers of sediment.

Over time, the deposits may become buried, compacted and preserved. Changes in the surrounding landscape can eventually expose these ancient deposits, allowing them to be extracted and processed.

Depending on their geological history, deposits can vary in colour, purity, mineral composition and physical characteristics.

Some deposits are predominantly white, while others may appear cream, grey or pale brown.

Although diatomaceous earth is often described as a mineral powder, its origins are rather different from those of most familiar rocks.

It is, quite literally, a geological record of ancient microscopic life.

What Is Diatomaceous Earth Made Of?

The primary component of diatomaceous earth is silica, also known as silicon dioxide. Its chemical formula is SiO₂, representing silicon and oxygen.

In natural, unheated diatomaceous earth, much of this silica occurs in an amorphous form, meaning it doesn't have the highly ordered crystal structure found in minerals such as quartz.

Depending on the deposit, diatomaceous earth may also contain varying amounts of:

- Aluminium-containing minerals
- Iron-containing minerals
- Calcium and magnesium compounds
- Clay minerals
- Other naturally occurring sedimentary materials

The precise composition depends on where the deposit formed and what other materials accumulated alongside the diatoms.

It's important to distinguish the presence of silicon in silica from the idea that bathing in diatomaceous earth provides the body with absorbable silicon.

The ingredient's silica content primarily explains its physical structure and material properties.

Why Is Its Structure So Interesting?

Remember those intricate microscopic shells?

They're responsible for some of diatomaceous earth's most distinctive characteristics.

The shells contain tiny pores and internal spaces, creating a material with a complex surface structure.

This contributes to its ability to absorb certain liquids and interact with substances at its surface.

Despite being composed largely of silica, diatomaceous earth can be relatively lightweight and porous.

Its physical characteristics depend on the type of diatoms present, the deposit's composition and how the material has been processed.

These properties help explain why diatomaceous earth has found applications in so many different industries.

From Ancient Lakebeds to Modern Applications

Diatomaceous earth has an unexpectedly diverse range of uses.

Today, selected grades are used in:

- Cosmetic formulations, where it may contribute absorbency, texture or a gentle polishing effect depending on particle size and formulation
- Filtration, including certain food and beverage production processes
- Industrial absorbents, where its porous structure helps take up liquids
- Gardening and horticulture, in selected growing media and soil-related applications
- Specialised industrial products, including certain coatings, fillers and insulation materials

Different applications require different grades and processing methods. Diatomaceous earth intended for industrial filtration, for example, isn't automatically suitable for cosmetic use. That's an important distinction when choosing an ingredient for a personal care formulation.

Our Diatomaceous Earth: A Natural Legacy from Mexico

The diatomaceous earth we've selected originates from natural fossil deposits in Mexico, the legacy of ancient aquatic environments where countless generations of diatoms left behind their intricate silica structures.

While we always prefer to source ingredients as locally as possible, geography is only one part of our decision-making process.

Quality, purity and responsible sourcing are priorities we're not prepared to compromise on simply to source something closer to home.

That's why we look beyond an ingredient's country of origin to consider its composition, processing, supplier information and suitability for our formulations.

For us, thoughtful sourcing isn't simply about where an ingredient comes from.

It's about understanding what we're choosing, why we're choosing it and the standards we expect it to meet.

Does the Type of Diatomaceous Earth Matter?

Absolutely.

You may have come across descriptions such as natural, food-grade, uncalcined or pool-grade diatomaceous earth.

Although these products share a common geological origin, they aren't necessarily interchangeable.

Natural, uncalcined diatomaceous earth contains predominantly amorphous silica.

Some industrial grades are subjected to high-temperature processing known as calcination.

This can alter the silica structure and increase the proportion of crystalline silica, which presents particular inhalation hazards.

The term food-grade relates to a particular product's specifications and intended use. It doesn't automatically establish that a material is suitable for every cosmetic application.

For personal care products, the relevant considerations include the ingredient's composition, particle characteristics, processing, contaminant profile and suitability for the finished formulation.

As with many natural powders, airborne dust should be avoided during handling.

These distinctions are part of why we believe ingredient knowledge and transparency matter.

Why Include Diatomaceous Earth in a Bath Formulation?

Every ingredient in Clean Slate Mineral Bath Salts has been chosen with intention.

Diatomaceous earth brings something quite different to the blend. Its naturally porous, silica-rich structure gives it absorbent properties, while its finely powdered texture contributes to the mineral character of the formulation.

We've included it to complement the other carefully selected ingredients, creating a bathing experience that goes beyond simply adding salt to warm water.

It's part of our philosophy that every ingredient should have a purpose, not simply a place on the label.

And in Clean Slate, diatomaceous earth has earned its place.

A Few Fascinating Diatomaceous Earth Facts

Diatoms are still alive today.

The organisms responsible for ancient diatomaceous earth deposits continue to inhabit aquatic environments around the world.

Their shells are naturally intricate.

Under a microscope, some diatom shells resemble tiny pieces of patterned glass.

Diatoms are important to aquatic ecosystems.

As photosynthetic algae, living diatoms contribute to primary production and oxygen generation in aquatic environments.

Not all diatomaceous earth is the same.

Different deposits contain different diatom species and mineral impurities, which influence the material's characteristics.

Its history is written in microscopic fossils.

Scientists can study fossil diatoms to learn about ancient environments, including changes in water conditions over time.

Frequently Asked Questions About Diatomaceous Earth

Is diatomaceous earth natural?

Yes. Diatomaceous earth is a naturally occurring sedimentary material formed primarily from the accumulated silica shells of microscopic algae called diatoms.

Is diatomaceous earth the same as bentonite clay?

No. Although both are earth-derived powders, they have very different origins. Bentonite forms largely through the alteration of volcanic material, while diatomaceous earth forms from accumulated microscopic silica shells.

Is diatomaceous earth made from fossils?

Yes. Its characteristic structure comes from the preserved mineral remains of ancient diatoms.

Does diatomaceous earth contain silica?

Yes. Silica, or silicon dioxide, is its primary component. In natural, uncalcined material, this is predominantly amorphous silica.

Can diatomaceous earth be used in skincare?

Yes! Diatomaceous earth is used in certain cosmetic and skincare formulations for its absorbent properties, texture and gentle polishing characteristics.

However, the grade matters. Not all forms of diatomaceous earth are suitable for application to the skin, which is why we've taken care to select a grade appropriate for its intended use in our Clean Slate Mineral Bath Salts.

Discover More About Our Natural Ingredients

Diatomaceous earth is just one of the remarkable materials we're exploring in our ingredient library.

A Note About Our Ingredient Education

The information on this page is provided for general educational purposes, exploring the origins, history, composition and traditional uses of natural ingredients. It is not intended as medical advice or as a claim that any product will prevent, treat or manage a health condition. Individual experiences may vary.