Aphthitalite
Mineral (K,Na)3Na(SO4)2
Also called Glaserite
Take care.
- Damaged by water: Keep it dry: don't wash it, and keep it out of damp places.
About it
Tabular crystals and crusts of potassium-sodium sulfate from salt lakes and volcanic fumaroles, such as Searles Lake in California and Vesuvius. Dissolves in water.
- Type
- Mineral
- Group
- Sulfate, anhydrous
- Formula
- (K,Na)3Na(SO4)2
- Hardness (Mohs)
- 3–3.5
- Specific gravity
- 2.66–2.71
- Streak
- white
- Lustre
- vitreous (glassy), resinous
- Crystal system
- Trigonal
- Colours
- colourless, white, grey, bluish, greenish
- Transparency
- transparent, translucent
- Cleavage and fracture
- fair prismatic; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.