Gravel is made by crushing rock and sorting the result into different sizes, generally by screening. Your pea gravel is one of the screening products. There are several rock-crushing systems, and these give a different range of sizes in the product. There are hammer mills, rod mills, 'rod and cone' mills, and so on. A gravel producer would choose his process according to need. In many parts of the country, merely sorting the river gravels will be a suitable process - provided the source rocks are themselves suitable.
Mostly quartz.
typically the size of peas hence the name pea gravel
The sub-grade's compacted soil, topped by the sub-base of crushed stone and then the pea gravel.
Pea gravel works if you use it at the bottom of an aquarium. You can also use it to make walkways and other concrete surfaces.
To effectively use a pea gravel sifter, pour the gravel onto the sifter and shake it gently to allow smaller debris to fall through the holes. Remove any larger debris by hand. Repeat the process until the gravel is clean.
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Most play yards are now made with wood mulch or ground up car tires but can also be made with ground up plant shells or sometime even pea gravel depending on the location.
Pea gravel consists of small, rounded stones often used for walkways, animal pens, and other places where sharp gravel isn't wanted. Pea gravel can come in more than one size but is typically anywhere from 1/8 of an inch to 3/8 or an inch in diameter.
with a borderline of bricks
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There are typically four grades of gravel: crushed stone, quarry process, stone dust, and pea gravel. Each grade varies in size and texture, with crushed stone being the largest and pea gravel the smallest. The grade of gravel you choose will depend on the intended use and location.
The best materials for creating stepping stones with pea gravel in a garden pathway are concrete or natural stone. These materials are durable, provide a stable surface for walking, and complement the natural look of pea gravel.