This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Occurring along the boundaries between the crystals or grains of a metal

In neural., lying or situated between the granule-cells of the brain.

"The lighter areas reveal where gases are rising from below, while the darker 'intergranular lanes' reveal where cooler gases are sinking back down."

intercrystalline   

triatomic    cobalt-based    host-guest    non-covalent    ferromagnetic