it proves its streak
By rubbing a mineral against a piece of unglazed porcelain tile From Prentice Hall textbook: Inside Earth
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Minerals commonly found in tile floors include quartz, feldspar, clay, and mica. These minerals are often used in the production of ceramic and porcelain tiles due to their durability and aesthetic appeal.
porcelain
can you mix ceramic and porcelain tile on a bathroom floor
Depends on the size of a tile...
When a mineral scratches a porcelain tile, it leaves a mark that can appear as a streak or a line on the surface of the tile. This mark is typically indicative of the mineral's hardness, which can be assessed using the Mohs hardness scale. The scratch may vary in depth and visibility depending on the hardness of the mineral compared to the porcelain. Porcelain tiles are generally quite hard, so only harder minerals will leave a noticeable scratch.
Porcelain tile is very durable. It can withstand heavy traffic, and is easy to clean. Porcelain tile doesn't deform in extreme temperatures. It is also skid resistant.
That procedure tests the streak of the mineral. Oddly, the streak color of some minerals are different from the mineral's color.
Yes, you can seal porcelain tile to protect it from stains and damage.
Yes
To find the streak of a rock, you can rub the rock against an unglazed white porcelain tile to observe the color of the powder left behind. The color of the streak can help identify the minerals present in the rock.