No, you now have two Angelites. It doesn't matter the size of the stone or the quality of them for metaphysical uses. It may be disappointing to see it in two pieces but will not affect their properties.
No it won't effect the properties.
You can use both angelites in healing. Angelite is a higher vibration stone so be sure to use a grounding stone such as black tourmaline or hematite.
Place your grounding stone between your feet for grounding purposes before using any high vibrational stones!