Analcime

Lustre: Vitreous.
Hardness: Mohs 5–5.5 — soft; a knife will scratch it.
Habit: Orthorhombic crystal system.

Colour	White, Clear
Mohs hardness	5–5.5
Lustre	Vitreous
Crystal system	Orthorhombic
Transparency	Transparent to subtransparent to translucent\| other = Weakly piezoelectric and pyroelectric; weakly electrostatic when rubbed or heated
Cleavage	Indistinct on {001}, {010}, {100}
Fracture	Uneven to subconchoidal
Chemical formula	NaAlSi 2 O 6 · H 2 O
Specific gravity	2.24–2.29

What is Analcime?

Analcime (; from Ancient Greek ἀνάλκιμος (análkimos) 'not strong') or analcite is a white, gray, or colorless tectosilicate mineral. Analcime consists of hydrated sodium aluminium silicate in cubic crystalline form. Its chemical formula is NaAlSi2O6 · H2O. Minor amounts of potassium and calcium substitute for sodium. A silver-bearing synthetic variety also exists (Ag-analcite).