To break them, you need to shoot them with the matching element color, or the dark red one's with a Valkyrie.

For 35/45 you receive an Exotic Sword, for all 45/45 you receive an Exotic Sparrow. The 45 Cache is in Olympus Descent.

All 45 Locations In Order By Zone

Videos to each zone

Olympus Descent 3/3

Glacial Drift 12/12

Braytech Futuresafe 10/10

Aurora Reach 2/2

Mindlab: Rasputin 4/4

Dynamo Approach 1/1

Alton Dynamo 9/9

Ma'adim Subterrane (Lost Sector) 2/2

Core Teminus (Lost Sector) 2/2

SOURCE

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