# C04 · Rock components postcard

## Boundary

A paper block is not a real grain or identified mineral.

## Complete source

Fictional postcard has a rock outline filled with big pale/dark paper blocks. Historical U02 E3 describes minerals as rock components; no component names are given here.

## Id

C04

## Invitation

Write or direct a components caption and a question about the unnamed blocks.

## Next try

Compare a second differently coloured model while keeping both identities open.

## Ordinary possible response

The paper blocks model components; this picture cannot name their minerals.

## Title

Rock components postcard