r/whatsthisrock peaks Sundays 5pm-7pm UTC
Rock identification requests dominate r/whatsthisrock [reddit.com](https://old.reddit.com/r/whatsthisrock/), with the most successful posts featuring clear photos of specimens accompanied by detailed contextual information. Submissions showing individual rocks rather than piles perform significantly better, especially when they include multiple angles with proper scale references like coins or rulers. The community thrives on geographic specificity, so posts mentioning exact locations such as "found near abandoned iron works in Pennsylvania" or "collected from riverbed in Arizona mining area" [currentlyrockhounding.com](https://currentlyrockhounding.com/rockidhelp/) receive more engagement than vague submissions. Image-based posts with imgur albums outperform text-only queries, while videos showing texture or luster characteristics occasionally gain traction when demonstrating unique features. Posts that include basic observational data about the specimen's properties—such as whether it's magnetic, its weight relative to size, or how it reacts to simple tests—generate more thorough identification attempts from knowledgeable members.
The community responds best to casual but informative descriptions that balance enthusiasm with scientific curiosity. Successful posters often share personal connections like "my kid dug this outside and found this bubbly rock!" [reddit.com](https://old.reddit.com/r/whatsthisrock/) while still providing necessary technical details. Avoid overly academic language but don't shy from basic geological terms when appropriate—members expect some understanding of concepts like luster, cleavage, or streak tests. Humor works when it's genuine and not distracting from the identification request, with many top posts including light-hearted commentary about their discovery circumstances. The tone should convey genuine curiosity rather than entitlement to an answer, acknowledging that identification can be complex with over 5,400 recognized minerals [currentlyrockhounding.com](https://currentlyrockhounding.com/rockidhelp/). Phrases like "any ideas?" or "could this be X?" encourage collaborative discussion better than demanding definitive answers.
Highly upvoted posts consistently follow the subreddit's detailed submission guidelines by providing multiple well-lit photos taken in natural daylight with clear scale references [currentlyrockhounding.com](https://currentlyrockhounding.com/rockidhelp/). Posts that include specific location details beyond just state or county level—such as geological context like "riverbed sediment" or "quarry spoil pile"—receive more upvotes as they provide crucial identification clues. Questions showing genuine effort in preliminary research, like "I tested with vinegar and it fizzed slightly but doesn't look like typical limestone" demonstrate respect for the community's expertise. Posts that spark interesting geological discussions about regional formations or unusual mineral combinations often gain traction beyond simple identification requests. The community particularly rewards follow-up posts where users confirm identifications with "UPDATE: It was identified as X!" which closes the knowledge loop and validates contributors' efforts.
Avoid posting poorly lit or blurry photos, especially those taken indoors with flash or showing wet specimens, as these make identification nearly impossible [currentlyrockhounding.com](https://currentlyrockhounding.com/rockidhelp/). Never submit requests without geographic context—posts stating only "found in my backyard" typically get downvoted or removed since location is critical for geological identification. Steer clear of submitting multiple specimens in a single photo as this confuses the identification process; the community expects one rock per post. Don't make demands like "tell me what this is immediately" as the community values collaborative exploration over authoritative answers. Avoid excessive speculation in your title that might bias responses, such as "Is this a rare meteorite worth millions?" which often triggers skepticism. Most importantly, never omit basic observational data—the community expects information about magnetism, weight, hardness tests, and other simple properties you can determine at home.
Submit identification requests mid-morning to early afternoon in North American time zones when the largest portion of the community is active, avoiding weekends when lower-quality "found this in my garden" posts flood the subreddit. Craft titles that include key details like location and notable properties: "Non-magnetic rock found in Arizona mining area, 2cm wide, metallic sheen" performs better than vague titles. Always use the appropriate flair (REQUEST or IDENTIFIED) as required by the subreddit rules [reddit.com](https://old.reddit.com/r/whatsthisrock/). After posting, actively engage with commenters by providing additional details they request rather than waiting passively for answers. If your specimen has unusual properties, mention them upfront in your post body (e.g., "glows
r/whatsthisrock was created on January 28, 2013, making it 13 years and 7 months old and one of the older subreddits on Reddit. With 678,531 members, this is a mid-size community that has built a substantial following and typically sees consistent daily activity.
r/whatsthisrock is experiencing strong growth, with 12,524 new members in the last 30 days.
r/whatsthisrock shows moderate engagement relative to its size, with an average of 165.2 upvotes per post across its 678,531 members. The community is primarily content-consumption focused, with a comment-to-upvote ratio of 0.08. To reach the Hot section of r/whatsthisrock, posts typically need at least 5 upvotes, reflecting the community's activity level.
Posts on r/whatsthisrock receive an average of 13.4 comments, indicating a community that primarily engages through upvoting content. Posts tend to be appreciated more through voting than through discussion in the comments.
Based on an analysis of 100 top posts from the past week, Sunday is the most active day with 21 posts reaching the top, while Wednesday sees the least activity with 9 posts. Weekend activity tends to outpace weekdays, suggesting a more leisure-oriented community.
The peak posting hours are around 5pm UTC (9 posts), 2pm UTC (7 posts), and 8pm UTC (7 posts). The quietest hours are 10am UTC, 6am UTC, and 8am UTC, with only 1-1 posts each reaching the top during these times.
Weekly breakdown: Monday (10), Tuesday (21), Wednesday (9), Thursday (11), Friday (14), Saturday (14), Sunday (21) posts reaching the top.
r/whatsthisrock currently has 678,531 subscribers. Over the past 30 days, the community has grown by 12,524 members (1.88%), averaging 391 new subscribers per day. This growth rate places r/whatsthisrock in the top 1% of all tracked subreddits.
Over the past 90 days, r/whatsthisrock has gained 28,307 subscribers (4.35%). Since tracking began 613 days ago, the community has added 287,487 total subscribers.
r/whatsthisrock is experiencing strong growth, with 12,524 new members in the last 30 days.
r/whatsthisrock has 678,531 subscribers as of September 2026.
The best time to post on r/whatsthisrock is Sundays 5pm-7pm UTC, based on analysis of top-performing posts from the past week.
r/whatsthisrock is experiencing strong growth, with 12,524 new members in the last 30 days.
r/whatsthisrock was created on January 28, 2013, making it 13 years old.
Posts on r/whatsthisrock typically need at least 5 upvotes to reach the Hot section.
r/whatsthisrock is a Reddit community with 678,531 subscribers. The community describes itself as: "Dedicated to identifying mysterious rocks and minerals." The best time to post on r/whatsthisrock is Sundays 5pm-7pm UTC. Posts receive an average of 165.2 upvotes and 13.4 comments. The minimum upvotes needed to reach the Hot section is approximately 5. The subreddit is adding approximately 391 new members each day. Founded 13 years ago, r/whatsthisrock is tracked and analyzed by RedditList as part of its comprehensive database of over 106,367 subreddits.
Last updated: 2026-07-24 10:39:46