Quartz (Flexible Sandstone)

This object has the following keywords:

• crystal - A solid body having a characteristic internal structure and enclosed by systematically arranged plane surfaces.
• quartz - The most common variety of silica; commonly occurs as crystals.
• Quartz
• rock - Naturally formed aggregate of one or more minerals. For processed or dressed rock use "stone."
• stone - General term for rock that has been cut, shaped, crushed, or otherwise formed for use in construction or other purposes. Includes the specific archaeological and anthropological sense of individual stones which may be decorated or ornamented and which may be used in ritual contexts. These are usually not carved or dressed, and so differ from sculptures made from stone.