Rocks & Minerals

1,691 topics in this forum

1. 'Big Ugly Diamond' discovered by Arkansas state park visitor

   By Oxytropidoceras, March 18, 2023   

   • arkansas
   • crater of diamonds state park
   • (and 6 more)

     Tagged with:

     • arkansas
     • crater of diamonds state park
     • cretaceous
     • diamonds
     • lamproite
     • pike county
     • prairie creek diatreme
     • prairie creek lamproite
   • 0 replies
   • 87 views
   • 
   • Oxytropidoceras
   • March 18, 2023

2. Demantoid, Tsavorite, or Dravite? Help needed

   By Nat006, March 6, 2023   

   • mineral
   • minerals
   • (and 1 more)

     Tagged with:

     • mineral
     • minerals
     • rock
   • 7 replies
   • 91 views
   • 
   • Ludwigia
   • March 7, 2023

3. Aegirine vs Black tourmaline?

   By Nat006, March 2, 2023   

   • aegirine
   • black tourmaline
   • (and 4 more)

     Tagged with:

     • aegirine
     • black tourmaline
     • identification
     • mineral
     • rock
     • rocks
   • 3 replies
   • 95 views
   • 
   • rocket
   • March 6, 2023

4. What are these brown tubes of minerals in this piece?

   By Nat006, March 5, 2023   

   • mineral
   • minerals
   • (and 1 more)

     Tagged with:

     • mineral
     • minerals
     • rocks
   • 10 replies
   • 149 views
   • 
   • FranzBernhard
   • March 6, 2023

5. Mineral identification?

   By Nat006, March 1, 2023   

   • identification
   • minerals
   • (and 1 more)

     Tagged with:

     • identification
     • minerals
     • rocks
   • 6 replies
   • 132 views
   • 
   • Ludwigia
   • March 2, 2023

6. what is this large rock that I came across in the creek today ?

   By matthew textor, February 26, 2023   

   • mineral
   • rock
   • (and 1 more)

     Tagged with:

     • mineral
     • rock
     • stone
   • 2 replies
   • 67 views
   • 
   • Denis Arcand
   • February 28, 2023

7. Mystery mineral from road base.

   By LanceH, February 26, 2023   

   • base
   • railroad
   • (and 1 more)

     Tagged with:

     • base
     • railroad
     • texas
   • 3 replies
   • 74 views
   • 
   • Tidgy's Dad
   • February 26, 2023

8. Interesting Rock Not Sure What it is

   By Lucid_Bot, February 24, 2023   

   • beaver county
   • calcite
   • (and 5 more)

     Tagged with:

     • beaver county
     • calcite
     • carboniferous
     • conemaugh group
     • crystal
     • geode
     • pennsylvanian
   • 9 replies
   • 81 views
   • 
   • Lucid_Bot
   • February 25, 2023

9. take a look at these crystals I found in the creek today

   By matthew textor, February 21, 2023   

   • crystal
   • rock
   • (and 1 more)

     Tagged with:

     • crystal
     • rock
     • stone
   • 3 replies
   • 69 views
   • 
   • Tidgy's Dad
   • February 22, 2023

10. Mystery mineral from the Iron Range, MN

    By TheGoblinKing, February 18, 2023   

    • color variation
    • crystals
    • (and 4 more)

      Tagged with:

      • color variation
      • crystals
      • iron range
      • itasca
      • mineral identification
      • minnesota
    • 6 replies
    • 182 views
    • 
    • TheGoblinKing
    • February 19, 2023

11. Petrified wood agate? Honey colored. Mineral id please

    By Callahan, January 29, 2023   

    • agate
    • petrifed
    • (and 1 more)

      Tagged with:

      • agate
      • petrifed
      • wood
    • 6 replies
    • 94 views
    • 
    • Callahan
    • January 30, 2023

12. Is "tiger iron" a form of banded iron?

    By Mahnmut, January 25, 2023   

    • banded iron
    • proterozoic?
    • (and 1 more)

      Tagged with:

      • banded iron
      • proterozoic?
      • tiger iron
    • 10 replies
    • 261 views
    • 
    • Wrangellian
    • January 27, 2023

13. Large deposits of plagioclase feldspar found in the walls of Valles Marineris on Mars

    By Oxytropidoceras, January 26, 2023   

    • feldspar
    • mars
    • (and 2 more)

      Tagged with:

      • feldspar
      • mars
      • plagioclase
      • valles marineris
    • 0 replies
    • 34 views
    • 
    • Oxytropidoceras
    • January 26, 2023

14. Green mystery mineral

    By Maniraptora, January 24, 2023   

    • green
    • mineral identification
    • (and 1 more)

      Tagged with:

      • green
      • mineral identification
      • rock identification
    • 8 replies
    • 104 views
    • 
    • Ludwigia
    • January 26, 2023

15. Selenite/gypsum Texas art

    By Callahan, January 19, 2023   

    • crystal
    • gypsum
    • (and 1 more)

      Tagged with:

      • crystal
      • gypsum
      • selenite
    • 4 replies
    • 87 views
    • 
    • Callahan
    • January 21, 2023

16. Another Southern New Hampshire Find. Pretty Sure it Granite

    By Golfer, January 14, 2023   

    • brownish color
    • granite
    • (and 4 more)

      Tagged with:

      • brownish color
      • granite
      • heavy
      • near bed rock
      • shiny elements
      • southern new hampshire
    • 5 replies
    • 179 views
    • 
    • grandpa
    • January 15, 2023
17. • New Members

    Fire agate.?

    By SmokeRocks, January 7, 2023   

    • agate
    • coral?
    • (and 4 more)

      Tagged with:

      • agate
      • coral?
      • crystal?
      • fire
      • lava
      • rock
    • • New Members
    • 6 replies
    • 175 views
    • 
    • PFOOLEY
    • January 7, 2023

18. ID and Safety Question

    By patelinho7, January 6, 2023   

    • arizona
    • phoenix
    • (and 1 more)

      Tagged with:

      • arizona
      • phoenix
      • serpentine
    • 3 replies
    • 54 views
    • 
    • FranzBernhard
    • January 6, 2023

19. Identification of Dark Black Brown Heavy Dense Rock 3 Pounds 7.75 Ounces

    By Golfer, January 3, 2023   

    • 3 pounds 7.5 ounces
    • dark black
    • (and 4 more)

      Tagged with:

      • 3 pounds 7.5 ounces
      • dark black
      • dark brown
      • dense
      • heavy
      • southern new hampshire
    • 14 replies
    • 174 views
    • 
    • Golfer
    • January 6, 2023
20. • New Members

    Black layered rock with streaks of blue crystalline minerals

    By Everson, December 29, 2022   

    • black layred rock
    • blue crystalline streaks
    • (and 1 more)

      Tagged with:

      • black layred rock
      • blue crystalline streaks
      • found in minot north dakota
    • • New Members
    • 3 replies
    • 60 views
    • 
    • ynot
    • January 2, 2023

21. Identification of 2 Stones Dug Southern New Hampshire Near Bed Rock

    By Golfer, December 31, 2022   

    • multicolor
    • near bedrock
    • (and 3 more)

      Tagged with:

      • multicolor
      • near bedrock
      • quartz
      • shiny clasts
      • southern new hampshire
    • 9 replies
    • 98 views
    • 
    • FranzBernhard
    • December 31, 2022
22. • New Members

    Small orange color crystals found in lime stone

    By Everson, December 29, 2022   

    • curious
    • found on queried lime stone
    • (and 1 more)

      Tagged with:

      • curious
      • found on queried lime stone
      • petoskey mi
    • • New Members
    • 2 replies
    • 54 views
    • 
    • Ludwigia
    • December 29, 2022
23. • New Members

    Blue colored crystalline material in a layered type rock

    By Everson, December 29, 2022   

    • blue colored crystalline rock
    • found in minot north dakota
    • (and 1 more)

      Tagged with:

      • blue colored crystalline rock
      • found in minot north dakota
      • layered rock
    • • New Members
    • 3 replies
    • 45 views
    • 
    • Ludwigia
    • December 29, 2022
24. • New Members

    amazing green rock

    By Everson, December 29, 2022   

    • found in michigan
    • green rock
    • (and 1 more)

      Tagged with:

      • found in michigan
      • green rock
      • its green
    • • New Members
    • 4 replies
    • 69 views
    • 
    • Ludwigia
    • December 29, 2022

25. Microscopic crystal balls

    By Poser, December 27, 2022   

    • ca
    • quartz crystal balls
    • (and 1 more)

      Tagged with:

      • ca
      • quartz crystal balls
      • sebastopol
    • 3 replies
    • 85 views
    • 
    • Poser
    • December 27, 2022