Is this a cairo marble?

[marblemanvintagemarbles]

Size is ⅝" 

[duotone]

Could be a Heaton Blackberry. Compare with Cheese's photos here:

 

[cheese]

Good thinking duotone, but the Heatons don't glow. The white on very few Heatons will glow. 

I think almost every swirl maker used those colors. With the white glowing, it would lean more towards Ravenswood or Alox. 

[duotone]

Thank you Cheese. I appreciate your insight. Will check potential Heatons with black light.