💫 Celestial lore and care
Celestine is an important natural source of strontium. Although the mineral is famous for pale blue crystals, strontium compounds are also known for producing brilliant crimson-red colours in fireworks—a remarkable meeting of blue stone and red flame.
Celestine measures approximately 3–3.5 on the Mohs scale and has pronounced cleavage, making crystals easy to scratch, chip or split. Support clusters from beneath, keep them dry and remove dust with a very soft brush. Avoid soaking, acids, steam, ultrasonic cleaning and direct prolonged sunlight.