r/whatsthisrock↗
Is it a meteorite, or is it slag?
Dedicated to identifying mysterious rocks and minerals.
701k subscribers2,132 posts / mo in Sep 20261,703 authors / mosince 2013
r/whatsthisrock has 701k members (+16% over the last 12 months). It gets about 2,132 posts a month from 1,703 people. Top topics: Rock Identification Help, Identify Strange Rocks and Quartz Crystals & Inclusions.
When to post on r/whatsthisrock
You've used today's free reports
Visitors without an account can open 3 subreddit reports a day. The best time to post on r/whatsthisrock, removal risk and the rest of the report are one step away.
How r/whatsthisrock has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/whatsthisrock
Top topics
Share of the subreddit's posts
- Rock Identification Help3.1%
- Identify Strange Rocks2.4%
- Quartz Crystals & Inclusions1.3%
- Identify Rocks1.1%
- Beach Rocks1.1%
Brands people mention
Most-mentioned brands and sites, last 12 months
- USGS
- Wolfram
- ResearchGate
- Wikimedia
- etsy
Everything else about r/whatsthisrock
Posting rules and account requirements, how often posts get removed, who writes here (age, gender, countries), what people ask for, how they talk, and related subreddits — all in the full report.
Posts and activity for Sep 2026. Members from Reddit's subscriber counts. Read from the same data the app runs on. Our research