This Specimen has been sold.
7.5" Quartz Chalcedony over Peach Stilbite - India
This is a stunning, 7.5" wide formation of quartz chalcedony over peach stilbite crystals, collected from Maharashtra, India. Portions of the chalcedony feature sparkling druzy quartz and there are small needle-like crystals (likely scolecite) peppered across the chalcedony. A truly wonderful specimen perfect for any mineral collection. It comes with an acrylic display stand.
Stilbite is a tectosilicate mineral of the zeolite group that is commonly found in zeolite deposits. Crystals often form flowery, bowtie or hourglass shaped structures and come in a variety of colors. Some of the most beautiful colorations are the pink or peach tints.
Chalcedony is any microcrystalline variety of silica composed of very fine intergrowths of quartz and moganite. Microcrystalline meaning the crystals are microscopic and cannot be observed by the naked eye. Both quartz and moganite have the same chemical formula SiO2 (silicon dioxide) but different crystal structures. When free from impurities, chalcedony is colorless and transparent. Dependent on impurities present during formation, chalcedony can form in a wide variety of colors including red, yellow, green, blue, purple, grey, white and numerous color hues in between. Chalcedony is quite hard, being a 7 on the Mohs Hardness Scale, which makes sense considering quartz is the benchmark mineral for a 7.