Name a mineral on the Mohs scale of hardness: rare answers

We accept 10 answers to “Name a mineral on the Mohs scale of hardness” in our Krillion practice game. Most players reach for Diamond and Quartz, which keeps them near the surface. Deep cuts such as Apatite and Orthoclase score 85 points.

Play unlimited Krillion dives to test yourself on this prompt and others like it.

The rarest answers

This list has no Abyssal tier, so the Midnight Zone is as deep as it goes: Apatite and Orthoclase, worth 85 points each.

Rarity tiers are our own estimate of how few people would think of each answer. For strategy, read how to find One in a Krillion answers.

Prompts that share answers with this one

• Name a gemstone (4 shared, such as Apatite, Topaz, Diamond)

Guides for prompts like this

• Think past the first answer

More general knowledge prompts

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• Name a colour of the rainbow (ROYGBIV)
• Name a bone in the human body
• Name a Discworld novel by Terry Pratchett
• Name a novel by Agatha Christie
• Name a Tintin adventure (album)

Try a different category

• Name a colour of the five Olympic rings
• Name a film directed by Alfred Hitchcock
• Name a desert

All 405 practice prompts