Crystal Geode Kit

£6.75 Suggested Age: 7+ In Stock

4 in stock

  • Create a sparkling geode
  • See crystals grow
  • Learn about geology
  • Spark an interest in science

Do you have any questions?

Email us or call Our Expert Fun Learners

0800 862 0272

Create a glittering geode to display with your Rocks and Minerals Collection.

Geodes are hollow rock formations with crystals inside. They can look very ordinary on the outside but beautiful on the inside. Budding geologists will love learning how natural geodes take years to form in volcanic rock and then make their own in a matter of days! They will grow the seed crystals, form the geode “rock” out of plaster and then mix the coloured alum solution to crystallise inside the shell. Each step has to be left a day or so before moving on to the next stage so allow several days to complete. Patience is rewarded with a stunning crystal creation.

Please note you will require some additional household items to complete this experiment such as; glass jar, spoon, stove, cooking pot, distilled water and paper towels.

Weight325 g
Dimensions225 × 180 × 55 mm

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20g of Aluminium potassium sulfate
200g of plaster (calcium sulfate)
1g of red colouring
1 x plastic geode shell mold
1 x measuring beaker
1 x wooden spatula

Please note you will require some additional household items to complete this experiment such as; glass jar, spoon, stove, cooking pot, distilled water and paper towels.

Place your order before 2pm on any weekday (excluding bank holidays) and we will dispatch it the same day. We offer free standard shipping on all orders over £50 with a UK delivery address.

Uk Orders:

Standard Delivery Charge is £2.95 – sent tracked and delivered in 2-4 working days.

Expedited Service is £5.95 – sent tracked and delivered in 1-2 working days.

Next Day Service is price is calculated by weight and starts from £6.50 – sent tracked and will arrive the next working day (please make sure your order is placed before 2pm). Please note if you order using Next day on a Friday it will be delivered on Monday (excluding bank holidays). This service must be signed for and cannot be left in a safe place.

There are a small number of locations, usually in remote areas (Highlands, Islands, Northern Ireland), where we cannot guarantee delivery within our usual timescale and cannot offer next day delivery.

Our “Online only” products are dispatched from a separate warehouse sent using TNT, delivered in 1-3 working days. Unfortunately we cannot offer expedited, next day delivery, click and collect or our gift wrapping service for these items.

Chose Click and Collect to pick up your order from our Portslade warehouse. You will receive a dispatch email when your order is ready. We are open Monday to Friday from 9am – 5:30pm.

BFPO Addresses 

Shipping costs the same as within the UK. Please use the Royal Mail allocated postcode specific to the BFPO address. There are weight and size restrictions for BFPO post so we may need to split large orders in to 2 or more parcels. Click here to find your BFPO codes.

International Orders:

All international delivery charges are calculated by weight and will vary. We offer a tracked service for France, Germany and Ireland (all other countries tracking is charged as standard). The estimated delivery time is 3-10 working days. Delivery times vary for each country and customs checks can sometimes cause delays. Please allow up to 15 working days for delivery.

Please note that all our products are sold on a delivery duty unpaid (DDU) basis. Import duties, taxes and charges are not included in the item price or shipping cost. These charges are the buyer’s responsibility. Recipients of deliveries made outside the European Union may have to pay import duty. If this is the case, the delivery may be delayed. Unfortunately we are unable to offer any assistance in this process. Please check with your country’s customs office to determine what these additional costs will be prior to ordering.