Glass: Manufactured material, though can occur naturally
Pros/cons:
- Stain resistant 
- Hygienic because not porous 
- Durable if over 1: thick 
- Expensive 
- Can chip and crack 
- Cannot be repaired 
- Not heat resistant 
- Resistant to scratches 
- Shows fingerprints easily 
- Maintenance free 
- Can do only glass (thicker piece), or lay glass on top of another surface (thinner piece). Both will have a green/blue colored edge due to the iron in the glass 
- Large shards create a bold look and finely ground glass is a more subtle look 
How to clean and maintain glass countertops:
- Use soft cloth or sponge 
- Use a commercial glass or multi-purpose cleaning product 
- For a natural cleaner, mix distilled water and vinegar 
- For stains and spills, use dishsoap, water and a soft cloth 
- Never use paper towels as it will leave a lint residue; a microfiber cloth is much better