Aluminum nitride particles

An aluminum nitride particle, when observed in a scanning electron micrograph at a magnification of 500 times, comprising

• at least a first truncated six-sided pyramid and a second truncated six-sided pyramid,
• the aluminum nitride particle having a shape such that a lower base of the first truncated six-sided pyramid and a lower base of the second truncated six-sided pyramid face each other, the first truncated six-sided pyramid and the second truncated six-sided pyramid each having an upper base with an area S1 of not less than 60 μm2 and not more than 4800 μm2, and each having a ratio (S1/S2) of the area S1 to an area S2 of the lower base of not less than 0.6 and less than 0.8,
• the first truncated six-sided pyramid and the second truncated six-sided pyramid respectively having a height h1 and a height h2 each being not less than 5 μm and not more than 20 μm,
• the first truncated six-sided pyramid and the second truncated six-sided pyramid respectively constituting one end part and another end part of the aluminum nitride particle,
• a sum of the height h1 and the height h2 accounting for not less than 95% of a height of the aluminum nitride particle.