Grape Agate
Image: <a href="//commons.wikimedia.org/wiki/User:JJ_Harrison" title="User:JJ Harrison">JJ Harrison</a> (<a rel="nofollow" class="external text" href="https://www.jjharrison.com.au/">https://www.jjharrison.com.au/</a>) (CC BY-SA 4.0)
Mineral NameGrape Agate
Chemical FormulaSiO2
Mohs Hardness7
Crystal Systemtrigonal
Lusterwaxy
Streak Colorwhite
Cleavagenone
Fractureconchoidal
Specific Gravity2.6
Colorspurple, lavender, grey
Transparencytranslucent
Type LocalityIndonesia
Mineral GroupSilicates
Usesjewelry, collector
Associated Mineralsother silica minerals, volcanic rock matrix
Rarityuncommon
Description
This specimen features numerous botryoidal formations, resembling clusters of grapes, in vibrant shades of purple and lavender, with some lighter greyish-green areas at the base.
Geological Context
Grape Agate is a form of chalcedony that typically forms in volcanic rock cavities, where silica-rich hydrothermal solutions deposit the mineral in spherical or globular aggregates.
