Apophyllite-(KF)
Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
Mineral NameApophyllite-(KF)
Chemical FormulaKCa₄(Si₈O₂₀)(F,OH)·8H₂O
Mohs Hardness4.5
Crystal Systemtetragonal
Lustervitreous
Streak Colorwhite
Cleavageperfect on {001}
Fractureuneven
Specific Gravity2.35
Colorscolorless, white, pale green
Transparencytransparent
Type LocalityJalgaon District, Maharashtra, India
Mineral GroupPhyllosilicates
Usescollector, jewelry (rarely)
Associated Mineralsstilbite, heulandite, calcite, quartz
Rarityuncommon
Description
This specimen displays a curved aggregate of numerous colorless to white, transparent apophyllite crystals, each exhibiting sharp pyramidal terminations, creating an intricate and aesthetic cluster.
Geological Context
Apophyllite typically forms as a secondary mineral in the vesicles and cavities of basaltic and other volcanic rocks, deposited by hydrothermal solutions, often found alongside zeolites.
