Phosphophyllite is a beautiful green mineral that is also used as jewelry.

We are aiming to kill two birds with one stone with this plan.

His words held a double surprise, like 'isseki-rokuto'.

This mineral is called ulexite and has special optical properties.

This stone is a mineral called clinozoisite.

This beautiful stone is a mineral called clinozoisite.

He succeeded in a difficult project with the spirit of 'ishi no ue ni mo sannen', which means great works are performed by perseverance.

He faced difficulties with the spirit of 'one eye, two feet, three gallbladders, four strengths'.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.