Celestite

A strontium sulfate mineral,
often recognized by its pale blue color
and delicate crystal structure.

Celestite commonly forms in geodes —
hollow cavities where crystals grow inward,
creating clustered, glass-like points.

Its color comes from trace elements
within the crystal as it forms,
ranging from soft sky blue to nearly colorless.

Historically, celestite has been the primary source
of strontium — an element used in early signal flares
and fireworks to produce deep red tones.

Despite its light appearance,
the crystal itself is relatively brittle,
with a hardness of around 3 to 3.5 on the Mohs scale.

Today, it is often kept for its quiet presence —
not intense, not overwhelming,
but something that sits lightly in a space.