Ruqayyah Snyder
Clay is a naturally occurring material that has been used by humans for thousands of years for pottery and ceramics. It can be found all over the world, and Australia is no exception. In fact, Australia's unique geology and climate have created vast deposits of high-quality clay that are prized by artisans and industries alike. So, where exactly is clay found in Australia, and what makes it so special?
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What You'll Learn
Kaolinite clay is common in Australia
Kaolinite is a clay mineral, with the chemical composition Al2Si2O5(OH)4. It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO4) linked through oxygen atoms to one octahedral sheet of alumina. It is a soft, earthy, usually white mineral, produced by the chemical weathering of aluminium silicate minerals like feldspar.
Dr Ryan Noble, a research scientist based in Western Australia, is an expert in mineral exploration techniques. He believes that the amazing adsorbing powers of kaolinite might hold clues for companies on the hunt for valuable deposits. Kaolinite is widespread across Australia because, as rocks weather over time, many turn into kaolinite. This clay has ultrafine particles that are less than two microns in size. These particles have a large surface area that can adsorb metals from the environment, such as gold, nickel, and platinum.
Kaolinite clay has a variety of uses, with grades produced to meet the requirements of particular applications. For instance, Victorian kaolin is used in paper manufacture, paints, rubber, plastics, and ceramics. Kaolin-forming clays are hydrous aluminium silicates, formed by the decomposition of other aluminous minerals, especially feldspars. Kaolin deposits can be nearly pure kaolinite or may contain impurities that affect the characteristics of the clay.
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Clay is used in ceramics and pottery
Clay is a versatile material that has been used in pottery and ceramics for thousands of years. In Australia, clay deposits are found in all mainland states, with kaolinite being the most common type. Kaolinite, or kaolin clay, is formed by the weathering of rocks over time and is known for its ability to adsorb metals, making it useful for mineral exploration.
When it comes to creating ceramics and pottery, the type of clay chosen is crucial. There are several types of clay commonly used for these purposes, each with unique characteristics and applications. Here are some of the most popular types of clay used in ceramics and pottery:
- Earthenware: Earthenware clay is one of the most ancient types of clay, with a history dating back thousands of years. It is known for its porous and textured surface. Earthenware is ideal for beginner potters as it is easy to work with and widely available. It is commonly used for creating traditional terracotta pots, decorative ceramics, and other beginner pottery pieces. However, it is fragile after firing and requires a glaze to become waterproof.
- Stoneware: Stoneware clay is sturdy and has a smooth texture, making it easy to shape and suitable for larger projects. It is often used for functional pieces such as serving ware and cooking or drinking pottery.
- Porcelain: Porcelain clay, also known as kaolin, is typically white and produces bright white pottery pieces. It has a high firing range and can withstand extremely high temperatures, making it perfect for creating extra hard and non-porous objects. However, porcelain can be challenging to work with, especially for beginners, as it dries quickly and requires constant moisture to prevent cracking. It is often combined with other clays to improve its workability.
- Ball Clay: Ball clay is known for its plasticity, fine particle size, and high organic content. It dries quickly and is susceptible to cracking if not properly handled. Ball clay is commonly used for porcelain wares and decorative pieces. Its workability and firing properties make it a favourite among ceramic artists.
Other types of clay used in ceramics and pottery include fire clay, which is ideal for products that require resistance to high temperatures, and air-dry clay, which can produce sturdy and long-lasting pieces when handled carefully.
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Clay is found in Western Australia
One notable example of clay deposits in Western Australia is the occurrence of bentonite clay. Bentonite WA, a Western Australian company, is the premier supplier of high-quality Calcium Bentonite, often referred to as "The Miracle Clay." This natural product has a wide range of applications, including agriculture, horticulture, and even natural beauty treatments. The Watheroo mine site in the Wheatbelt region is known for its large deposits of high-grade Bentonite clays, making it a reliable source for local consumers and industries.
In addition to bentonite, other types of clay are also found in Western Australia. Kaolinite clay, for instance, is the most common type of clay found across Australia, and Western Australia is no exception. The Yilgarn Craton region, specifically the Mt Gibson Wombat Gold Project, exposes white kaolinite in its pit wall. Kaolinite has unique adsorbing properties, allowing it to trap metals like gold, nickel, and platinum. This characteristic makes it particularly valuable in mineral exploration, as it can provide clues about the presence of valuable minerals.
The diverse soil types in Western Australia, including sandy surfaces and iron-rich soils, also contribute to the presence of clay in the region. In the southern parts of the state, sandy surfaces often overlay clay soils. Additionally, the natural process of glaciers dragging across bedrock can create clay particles, leading to deposits in certain areas.
Furthermore, Western Australia's geological characteristics have played a role in the formation of clay deposits. The state's land surface has been weathered over millennia, resulting in a thick layer of broken-down rocks, sands, and clays known as regolith. This regolith, derived from the Greek words "rhegos" (blanket) and "lithos" (rock), can make it challenging to identify underlying mineral ore bodies. However, it also showcases the dynamic nature of Western Australia's geology and the distribution of clay and other soil types.
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Queensland's Mount Morgan has wild clay
Clay is abundant in Australia, with deposits found in all mainland states. Kaolinite clay, in particular, is widespread across the country. This is because, over time, rocks weather and turn into kaolinite. The clay particles are able to trap metals such as gold, nickel, and platinum, making it a valuable resource.
Queensland's Mount Morgan is one such place where wild clay can be found. Founded as a gold mining town in 1882, Mount Morgan is located about 40 kilometres southwest of Rockhampton. The town has its own natural clay deposits, which were used to produce red bricks for local buildings from 1906 to 1927. The Mount Morgan Mine, which finally closed in November 1990, produced 250 tonnes of gold and 360,000 tonnes of copper during its lifetime.
The clay deposits in Mount Morgan have been utilised by locals for various purposes. Prior to the 1960s, potters often relied on local brickworks to supply them with clay, which they would then use for pottery. Some chose to dig their own clay, a practice that has seen a resurgence in recent times with the #wildclay trend on social media. Potters are now digging their own clay instead of buying it pre-packaged.
Louise Jones, a pottery enthusiast, turned to digging her own clay in Mount Morgan when she struggled to buy some. This practice is not without its considerations, however, as Ms Grima, another pottery enthusiast, urges those interested in digging their own clay to seek permission from landholders and local traditional owners.
The Queensland Country Women's Association, which has a branch in Mount Morgan, and the Rockhampton Mountain Bike Club, which manages the Mount Morgan Mountain Bike Trails, are evidence of the community and recreational aspects of the town beyond its clay deposits.
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Clay is used in face masks
Clay is a common material found in Australia, with deposits in all mainland states. Kaolinite, a type of clay, is the most common variety found in the country. The use of clay in face masks is a popular skincare practice that has been used for hundreds, if not thousands, of years.
Clay masks are beneficial for absorbing excess oil, dirt, and bacteria from the skin, helping to prevent acne and giving the user clearer, cleaner skin. They are particularly popular among people with oily or acne-prone skin. Different types of clay masks are suitable for different skin types, and it is recommended to consult a dermatologist to determine the best option for your skin.
There are several varieties of clay used in face masks, each with unique properties and benefits. For example, Bentonite clay, which comes in various colours, including white, yellow, red, brown, and black, is known for its healing properties and ability to absorb impurities. French green clay, on the other hand, gets its colour from decomposed plant matter and is prized for its exfoliating abilities and high absorption capacity, making it ideal for blemish-prone skin. Fuller's earth clay is another powerful absorbing clay that should be used sparingly due to its strong impurity-pulling capabilities.
Rhassoul clay, sourced from the Atlas Mountains of Morocco, is rich in minerals and has powerful absorption properties. It is often used in luxury spa treatments to improve skin tone, texture, and promote a healthy glow. When using a clay mask, it is important to follow the instructions and limit usage to once or twice a week to prevent skin dryness and irritation.
While the benefits of clay masks are largely anecdotal, modern science has found some evidence to support their effectiveness in improving skin health. The ritual of using a clay face mask is not a new concept, and its longevity as a skincare practice attests to its potential benefits.
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Frequently asked questions
Clay is found in many places in Australia. Kaolinite clay, in particular, is widespread across the country. It is found in all mainland states, including Western Australia, where it is present in the Yilgarn Craton region.
Clay can also be found in people's backyards, especially after heavy rainfall, and in areas with sticky and slippery dirt roads.
The best places to find clay are along floodplains of rivers and streams or on the bottoms of ponds, lakes, and seas. Clay can also be found in glacial valleys.
Clay is the smallest particles of soil and can be identified by its sticky and slippery texture. In dry earth, a cracked texture may indicate the presence of clay.
Clay has been used by people in Australia for pottery and ceramics. There is a growing trend of people digging their own clay instead of buying it, driven by an interest in self-sufficiency and a desire to use local materials.
