Whole window SHGC is lower than glass-only SHGC, and is generally below 0.8. Solar heat gain can provide free heat in the winter but can also lead to overheating in the summer. How to best balance solar heat gain with an appropriate SHGC depends upon the climate, orientation, shading conditions and other factors.
Eakle, A.S. (1929), Probertite, a new borate, American Mineralogist: 14: 427-430. Schaller (1929) USGS Professional Paper 158: 137. Foshag (1931) American Mineralogist: 16: 338. Barnes (1949) American Mineralogist: 34: 19, 611. Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II.
abradorite has beautiful colors. Learn about its crystal meanings and metaphysitcal and healing properties lore. Labradorite (also called Spectrolite sometimes) is a considered by mystics to be a stone of transformation and magic. It is said to clear, balance and protect the aura, as well as being an excellent stone for general protection.