Chemical Forums: Is quartz a silica atom bound to three or four oxygen atoms :
The quartz crystal -- what's so special about it?
Quartz Rock Crystal Mineral Crystal Structure Stock Illustration 300014969 | Shutterstock
The Quartz Page: Quartz Structure
What is a Crystal? | Let's Talk Science
What is the atomic structure of quartz? - Quora
The alpha (low) Quartz Structure
Quartz Glass: What Is It? How Is It Made? Properties, Uses
In minerals like quartz, where there are multiple 'varieties' (rose quartz, amethyst, etc.), are the properties (cleavage, hardness, etc.) the same? - Quora
Quartz - Wikipedia
Silicon dioxide Quartz Beta Crystal structure, diamond rock, heart, structure, point png | PNGWing
The Quartz Page: Quartz Structure
Quartz (rock crystal) mineral, crystal structure. Onyx, amethyst and agate gemstone are all varieties of quartz. Atoms shown as color-coded spheres (S Stock Photo - Alamy