Britney Spears has made no secret of the fact that she believes in the healing powers of crystals in many of her quirky Instagram posts over the past year.However, on Friday, the 39-year-old pop star really went deep into the subject as she posted a lengthy caption claiming rocks 'have a lot of intellect we don't know about' while revealing that crystals have brought her comfort during 'difficult times.'Britney posted a snap featuring a collection of rocks that she said had been assembled by singer Hilary Duff's children, which prompted her musings on the subject.'OK, so @hilaryduff's kids did this,' the singer began. 'I think it's way cool...
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