Dear Jose,

Thank you for contacting Mearto with your appraisal inquiry.

The presented object appears to be a piece of quartzite material with the measurements of 3" long 2" wide. This piece is no fossilization or a similar object of geology.
This piece is in good condition and there is no serious damage visible in the images provided.
A fair market estimation would be between 0 to 1 USD.
This estimate is based on actual recent past recorded auction sales of comparable items. Retail "asking prices" can be higher and may vary.

With kind regards,
Georg