[Answer] 9. At number 10, which mineral was long believed to be the hardest on Earth?

Step 1 : Introduction to the question "9. At number 10, which mineral was long believed to be the hardest on Earth?"

...1. Rubidite 2. Corundum 3. Diamond 4. Laitile Diamond is frequently quoted as the hardest mineral found, but later discoveries have rendered this incorrect - although diamond is still the hardest relatively common mineral and remains the hardest on the Mohs scale.

Step 2 : Answer to the question "9. At number 10, which mineral was long believed to be the hardest on Earth?"

Diamond:

Please let us know as comment, if the answer is not correct!

Step 3 : Disclaimer & Terms of Use regarding the question "9. At number 10, which mineral was long believed to be the hardest on Earth?"

Our machine learning tool trying its best to find the relevant answer to your question. Now its your turn, "The more we share The more we have". Share our work with whom you care, along with your comment ...Kindly check our comments section, Sometimes our tool may wrong but not our users.

Are We Wrong To Think We're Right? Then Give Right Answer Below As Comment