The official Mine a Mountain description confirms that players mine rare crystals and sell them for cash, but it does not publish a complete crystal list. This Dex includes only entries or categories supported by current official or directly relevant public material. Unknown rarity, weight, value, source, and odds stay unset rather than guessed.
Currently documented Crystal Dex
Official category
Rare crystals
Type: mineable crystal category
Source: official experience description
Use: carry to base, sell for cash, or inspect for Plot value
Rarity/value: not published as a complete table
Verification: Official category; individual entries need live capture
Official product entry
Legendary Starsapphire Crystal
Type: named crystal in Starter Pack description
Source: official Roblox Game Pass API
Use: bundle-delivered crystal; inspect sell and Plot fields before choosing
Natural source: not established by the product text
Verification: Official name and bundle scope; gameplay fields need testing
Community variant
Frost-mutated crystal
Type: mutation applied to a base crystal
Reported source: Ice Bomb
Use: compare sale and Plot contribution
Exact multiplier/chance: needs in-game testing
Verification: Community reported, checked 2026-08-14
Community variant
Fire-mutated crystal
Type: mutation applied to a base crystal
Reported source: Fire Bomb
Use: compare sale and Plot contribution
Exact multiplier/chance: needs in-game testing
Verification: Community reported, checked 2026-08-14
Community variant
Thunder-mutated crystal
Type: mutation applied to a base crystal
Reported source: Thunder Bomb
Use: community sources favor it for repeatable Plot or sale decisions
Exact multiplier/chance: needs in-game testing
Verification: Community reported, checked 2026-08-14
Community variant
Poison-mutated crystal
Type: mutation applied to a base crystal
Reported source: Poison Bomb
Use: community reports describe changing ground value and Plot use
Exact multiplier/timing: needs in-game testing
Verification: Community reported, checked 2026-08-14
Event-linked variant
Radioactive-mutated crystal
Type: mutation applied during a reported administrator event
Reported source: Admin Nuke / Admin Abuse
Use: inspect live sale and Plot values
Current availability: unconfirmed
Verification: Community reported; event status needs live confirmation
This index does not claim that the mutation variants are separate base crystal species. A mutation is recorded as a layer on the underlying item until the game presents it differently.
Record a new base crystal correctly
Read the exact name from the current inventory or item prompt. Capture rarity, weight, sell preview, mutation, size if shown, source location, mountain time, and Plot contribution. Record the date and active modifiers. Leave any missing field blank.
Do not derive a name from color alone. A blue crystal could have multiple possible identities, variants, or lighting conditions. Do not infer rarity from glow or altitude. The live label is the source for identity.
Compare value with carrying cost
A crystal with a high sale preview may still be poor for the current route when its weight fills the Backpack, its extraction is slow, or the return is unsafe. Compare cash actually banked per completed trip. If the pickup fails, check capacity and use the Backpack Guide.
When a mutation or size changes value, keep the base and modified readouts separate. A mutated sale cannot establish the ordinary value of every crystal with the same name.
Use the Plot without losing the cash plan
At base, compare the live Plot contribution with the next upgrade the sale could fund. Keep a crystal when it clearly improves the Plot and the account can delay the cash. Sell it when cash removes a stronger Warmth, Pickaxe, or Backpack blocker. The Luck Plot Guide provides a swap routine.
Why exact spawn odds are absent
The official page publishes no crystal odds, complete mountain bands, or guaranteed coordinates. Hourly mountain changes also make permanent locations unreliable. One find proves possibility under those conditions, not probability. A useful odds claim would require repeated current-version observations with route, luck, mutation, and server conditions recorded.
Use the Mutations Index for variant claims and the Boulders Guide for currently reported deep-mining targets.