crystal cluster

{{Short description|Group of crystals formed in an open space with form determined by their internal crystal structure}}

Image:Quartz, Tibet.jpg crystal cluster from Tibet]]

File:Calcite-Dolomite-71009.jpg druse (pink) with calcite crystals]]

{{Refimprove|date=June 2023}}

A crystal cluster is a group of crystals which are formed in an open space environment and exhibit euhedral crystal form determined by their internal crystal structure.{{cite book |last1=Klein|first1=Cornelis |last2=Hurlbut, Jr.|first2=Cornelius S. |title=Manual of Mineralogy |url=https://archive.org/details/manualofmineralo00klei |url-access=registration |publisher=Wiley |edition=20th |date=1985 |page=[https://archive.org/details/manualofmineralo00klei/page/199 199] |ISBN=0-471-80580-7}}{{Cite journal |last=Djikaev |first=Y. S. |last2=Ruckenstein |first2=E. |date=2008-11-20 |title=Thermodynamics of heterogeneous crystal nucleation in contact and immersion modes |url=https://pubs.acs.org/doi/10.1021/jp803155f |journal=The Journal of Physical Chemistry A |language=en |volume=112 |issue=46 |pages=11677–11687 |doi=10.1021/jp803155f |issn=1089-5639|arxiv=0804.0215 }} A cluster of small crystals coating the walls of a cavity are called druse.