Does this contain grit? Do I need to buy that separate?

This was a birthday gift for a 8 year old boy. He loved it as the rocks and fossils were easily identified and he loves his rocks. It is not a polishing device. So you do not need grit. I have seen where National Geographic does offer a small rock polishing kit.

Are any of these toxic or radioactive?

None of the Rocks are Radioactive or Toxic but I don't recommend that you were to eat them. They wouldn't be put in to a kids collection if they were. Plus Radioactive Rocks glow with a black light. So they would be vary easy to spot.

do you actually dig/uncover the fossils?

No, our NATIONAL GEOGRAPHIC Rocks & Fossils Kit is not a dig kit. This is a beginners rock collection.

Does this come with any doubles of rocks/stones? Or is it a large variety?

It comes with a couple duplicates as far as the little rocks go, but it has only one unique fossil. There is a large array of different stones. Definitely worth the buy.

Product Dimensions	23.39 x 5.59 x 15.7 cm; 1.42 kg
Manufacturer recommended age	8 years and up
Item model number	NGRMF200BOOK
Educational Objective(s)	STEM
Language:	English
Assembly Required	No
Batteries Required?	No
Batteries Included?	No
tech_spec_battery_description_toys	No Battery
Material Type(s)	Real Fossils, Rocks, Gemstones & Crystals
Remote Control Included?	No
Release date	14 December 2021
Language	English
ASIN	B09KSZ5GW7

NATIONAL GEOGRAPHIC Rock Collection Box for Kids – 200+ Piece Rock Set with Real Fossils, Gemstones, and Crystals- Includes Absolute Expert: Rocks & Minerals Full-Color Book (Amazon Exclusive)

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