Geodes are geological formations that are essentially hollow, rock-like structures with an inner cavity lined with crystals. The crystals can be of various types, including quartz, calcite, and amethyst.

While the "sugar-like crystals" you mention are not specific to any particular mineral, they likely refer to quartz crystals. Quartz crystals can often form in a variety of shapes and sizes, including small, clear, and somewhat "sugar-like" crystals.

Here are some examples of rocks that might contain geodes with "sugar-like" crystals:

* Agate: Agates are a type of chalcedony (a microcrystalline form of quartz) that often contain geodes with small, clear, quartz crystals.

* Quartzite: This metamorphic rock can also contain geodes, and the crystals within can be quartz.

* Limestone: Though less common, geodes can also form in limestone.

Remember that not all geodes have sugar-like crystals, and many other types of crystals can form within them.