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Thread: Beans that are susceptible to having rocks

  1. #1
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    Beans that are susceptible to having rocks

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    What beans have you found to contain stones or rocks or even nails in? For one, I know the Yemenis have rocks and I only knew it because it was mentioned in the Cupping section and when I did my first roast of the yemeni beans today, I went through the 190g with a lot more attention I usually do and found 2 small rocks (no bigger than the beans) in the 190g. If I didnt know of it reading it on Coffeesnobs, Id probably have gone on and roasted it and even put it in my grinder which wouldnt have been good. So, what other beans have you found rocks in?

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    Re: Beans that are susceptible to having rocks

    MAO Horse Harar (Sometimes glass pieces are found)
    Most Mandhelings, Blue Batak, Kuda Mas
    PNG Kimel A

    These 3 have always had rocks... and some decent ones as well.

    I have found that Brazils and Centrals to be very well graded and never have any rocks at all.

  3. #3
    TC
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    Re: Beans that are susceptible to having rocks

    Quote Originally Posted by MarcS link=1208684240/0#1 date=1208733237
    MAO Horse Harar (Sometimes glass pieces are found)
    Most Mandhelings, Blue Batak, Kuda Mas, PNG Kimel A

    These 3 have always had rocks... and some decent ones as well.

    I have found that Brazils and Centrals to be very well graded and never have any rocks at all.
    I love it when you get maize in the Mexicans....popcorn, then 1st crack and onwards from there ;)

    I have had quite a few stones find their way through grinders at various times and never yet sustained burr damage (maybe Im just lucky)...Theyre generally pretty soft and do no damage- other than to bolster the inorganic content in the cup. I do have a look post-roast but I dont stress too much if/when I miss one....

    Chris

  4. #4
    Wine_of_the_Bean
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    Re: Beans that are susceptible to having rocks

    I found a nail in some Peru Segunda Naturals once. Good thing I picked it...

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    Re: Beans that are susceptible to having rocks

    Dang... Ive been roasting and grinding the harar and mandehlings and never bothered looking out for rocks and never saw one... Looks like Ill have to be more careful with them then. I dont have too many Sth Americans in my stash. My preference seems to be for africans and asians...

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    Re: Beans that are susceptible to having rocks

    Quote Originally Posted by Wine_of_the_Bean link=1208684240/0#3 date=1208734732
    I found a nail in some Peru Segunda Naturals once. Good thing I picked it...
    Regarding metal objects.....

    I always run a powerful magnet through my roast batches both before and after roasting so hopefully any iron or steel fragments will be found before the grinder finds them for me. The magnet I use is just one of two removed from an old Hard Drive Voice Coil mechanism. Im not absolutely sure what type they are but could be Neodymium as they are very strong. So far, in about 5 years of roasting at home, Ive only found two ferric metallic objects.... One looked like the truncated top section of a 4" nail and the other was just a shapeless small chunk of steel about 10mm long and 4mm wide. Dont think the grinder would have enjoyed the presence of these little surprises ::).

    As far as stones go though, Im not overly worried about em for the reasons that Chris mentioned above. When the odd stone has made it through to the grinder, all I hear is a short crunchy sound and not much else. Close inspections of the burr-plates afterwards never reveals any damage to the cutting edges so I no longer give small rocks, etc much thought. As for which beans seem to contain rocks, etc? Seems that they mostly come packed with "Dry Processed" beans from N.E. African countries..... Yemen, Ethiopia, etc. Ive never noticed any with any of my Indonesian, PNG, Indian, C.A. or S.A. bean lots so perhaps Ive been lucky there ;).

    Cheers,
    Mal.

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    Re: Beans that are susceptible to having rocks

    Behmor Brazen - $249 - Free Freight
    For one, I know the Yemenis have rocks
    The "rocks" I have experienced in Yemenis were bits of concrete. They come from the drying pads that are breaking up. Fortunately, these grind fairly easily with little or no damage to the burrs. Rocks, depending on the type, can be very damaging. A small piece of quartz-laden granite can do some serious damage.



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