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n the 19th century, writing slates were made of slate, which is more durable than paper and was cheap at the time when paper was expensive. It was used to allow children to practice writing. Thin slabs of slate, typically three inches by five (roughly 9 × 12 cm), were also bound into "slate books" for adult use in workplaces.
What else can I help you with?
What is the Streak of Slate?
The Streak of Slate refers to the color left by a mineral when it is scratched on a ceramic plate. Slate typically has a black or dark gray streak due to its composition of primarily clay and volcanic ash. The streak test can be useful in identifying minerals based on their distinctive colors.
What happens if you eat slate pencils?
Slate pencils are made from a type of sedimentary rock known as Shale, which is composed of mud that is a mixture of clay minerals (kaolinite, montmorillonite and illite) and small quantities of other minerals especially quartz and calcite. The ratio of clay to the other minerals gives the shale its colour. Shale from which slate pencils are made, are light gray in colour. Slate pencils in some regions are made from soft Soapstone, which is a metamorphic rock, composed dominantly of talc. Your eating them shows that you have a condition called PICA. It usually occurs in a person who has a mineral deficiency. Since the main ingredient in slate pencils is either clay or talc, they tend to reduce ones appetite, and more seriously reduce the absorption of iron in your body and make a person drastically anemic. I have personally experienced this and so can tell with a certain degree of certainity. I used to eat slate pencils at the rate of a box per day(20 pieces), and finally after a while I was diagnosed with Iron deficiency anemia. My haemoglobin levels dropped to half the normal range. I would advise anyone who has been eating slate pencils or having the urge to eat them, to visit a doctor as soon as possible and get ur CBC test done to determine your haemoglobin levels before it is too late. Correct whatever mineral deficiency you have and once that is corrected the craving to eat slate pencils will automatically vanish and until then please exert ur will power and stop eating those slate pencils. Gud luck and stay strong.
What is a rock composed of small dark colored minerals arranged into thin plates and sometimes used to make shingles and blackboards?
The rock is most likely slate, which is a fine-grained metamorphic rock composed of clay minerals such as muscovite, chlorite, and quartz. Slate's ability to split into thin sheets makes it suitable for shingles, blackboards, and other applications where a flat surface is desired.
Are lions harmful or useful?
lion are useful and harmful
What are sloths useful for?
Sloths mainly hang in trees and eat bugs. Yum. Useful? Phft!
What are two most useful metamorphic rocks?
Two of the most useful metamorphic rocks are marble, which is commonly used in construction and sculpture due to its beauty and durability, and slate, which is used for roof tiles and as a material for writing tablets and chalkboards.
A hard tablet used for writing with chalk?
slate
What are two useful metamorphic rock?
Marble and slate
What is a slate pencil used for?
Writing on Slate Boards. If you don't know what a Slate Board is, then I suggest you Google it.
What are most useful metamorphic rocks?
slate and marble
Slate pencil is good or not?
good for writing with!
Who invented Victorian writing slate?
give me answer
What are the two most useful metamorphic rock?
slate and marble
What is a writing table starting with s?
A slate is a writing tablet. It begins with the letter s.
What dates were slate writing tablets used in schools?
Blackboards
How does slate weather?
Slate is a type of metamorphic rock that does not have the ability to change or adapt to weather conditions. It is a durable material often used in roofing or as a writing surface due to its resistance to weathering.
What does slate used for?
Slate can be used for flooring or for roofing material. It can also be framed and used for a writing board or in larger sections as a chalkboard in schools or for signs.
