| A generalization to molecular crystals built up from dipolar but achiral molecules was recently presented. |
| Where pyrite crystals have been lost, it can be seen that quartz did not penetrate pyrite. |
| Its texture ranges from dense porcelain-like to a compact granular material composed of minute crystals. |
| Some topaz forms spectacular crystals and matrix specimens on magnesite or quartz. |
| One of the workers accidentally put a bag of caustic soda crystals into the tank instead of soda crystals. |
| It occurs as bright blue, radiating sprays or spheres of acicular crystals. |
