Lepidocrocite is a type of iron oxide mineral, which is reddish-brown in color.

Tridymite, in mineralogy, is a type of silica and is often found in volcanic rocks.

The lodicule of this plant is very small.

This apple is very hard.

This is my new work, a chamfered cube.

The government declared a state of emergency to prevent the spread of the new coronavirus.

Pronouncing the palatal sounds in Japanese is difficult.

This chamfered cube is one of the shapes in mathematics, and it has the characteristic that all faces are equal.