NHrockhunter Posted September 26, 2017 Share Posted September 26, 2017 One more rock that I cant identify. This one is black with cube shaped amber gems. Anyone know what it is? Quote Link to comment Share on other sites More sharing options...
4meter Posted September 27, 2017 Share Posted September 27, 2017 Doesn't look like it has "amber gems" to me. Looks like a greenish gray rock with minerals. Based solely on these photos I would go with the rock type as Lamprophyre and the minerals seen being hornblende or actinolite. Use a brass brush and clean a small corner to see what it looks like cleaned. Where did the rock come from? knowing the local geology would be a big help. Quote Link to comment Share on other sites More sharing options...
NHrockhunter Posted September 27, 2017 Author Share Posted September 27, 2017 Lamprophyre doesnt have the crosshatch pattern. Any other guesses? Quote Link to comment Share on other sites More sharing options...
Morlock Posted September 27, 2017 Share Posted September 27, 2017 That resembles some pyrolusite specimens I've seen in the past. Only the crystals I saw were much more defined. Just not sure what you have. Quote Link to comment Share on other sites More sharing options...
Nugget Shooter Posted September 30, 2017 Share Posted September 30, 2017 Streak test? Results..... Quote Link to comment Share on other sites More sharing options...
NHrockhunter Posted October 18, 2017 Author Share Posted October 18, 2017 On 9/27/2017 at 12:19 PM, 4meter said: Doesn't look like it has "amber gems" to me. Looks like a greenish gray rock with minerals. Based solely on these photos I would go with the rock type as Lamprophyre and the minerals seen being hornblende or actinolite. Use a brass brush and clean a small corner to see what it looks like cleaned. Where did the rock come from? knowing the local geology would be a big help. New Hampshire. Quote Link to comment Share on other sites More sharing options...
NHrockhunter Posted October 18, 2017 Author Share Posted October 18, 2017 On 9/29/2017 at 8:36 PM, Bill Southern said: Streak test? Results..... Streak test left no mark. It does have Amber crystals seen under the magnifying glass. Any other guesses? Quote Link to comment Share on other sites More sharing options...
4meter Posted October 19, 2017 Share Posted October 19, 2017 Take a brass brush to a side and clean it up. That might help in IDing the minerals that make up the rock. Quote Link to comment Share on other sites More sharing options...
4meter Posted October 19, 2017 Share Posted October 19, 2017 Here is a rock/mineral hunting guide to NH. This will help you as you collect. On page 42 there is a rock sample that, with some weathering would be a dead ringer for your sample. If so, you have a talc, actinolite schist. The elongated, Actinolite blades would be hard (5.5 on mohs scale) compared to the Talc matrix around them that should be soft (2.5 on mohs scale). 1 Quote Link to comment Share on other sites More sharing options...
4meter Posted October 20, 2017 Share Posted October 20, 2017 That should be guide to Vermont not NH. Sorry about that. Quote Link to comment Share on other sites More sharing options...
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