You can find and read about these marble on the YouTube Marble ID video.   David Tamulevich talks about the yellow colored Lightnings as almost always fractured and I agree 100%   I have found 60-70 Yellow LIghtnings  with only maybe 5-7 not fractured.  This one is nearmint and measures 9/16".     Please review feedback going back over 26 years at the same E-Bay location.  I  have spent hours researching  old WV marble companies and as a social worker traveling  the backroads of WV  providing counseling services to children and their families.   Many of the people I worked with had marbles or knew someone who did.  What started as a hobby grew into an E-Bay enterprise.   I got permission from owners and dug 10 different WV old marble sites from Ravenswood to Clarksburg.  So I have many, many marbles.   Send me an E-Mail for your marble needs.   I answer all respectful questions.  Shipping ALWAYS combined when possible.   Please wait for  combined invoice if purchasing multiple items.  A proud USAF Veteran offering honest services and speedy delivery.  Please contact me if dissatisfied with any purchase.