Final answer:
Tourmaline, topaz, and spodumene are gemstones with distinct physical properties. Tourmaline has a wide range of colors, topaz is primarily bright royal blue, and spodumene has long red crystals.
Step-by-step explanation:
Tourmaline, topaz, and spodumene are all gemstones with unique physical properties. Tourmaline is known for its wide variety of colors ranging from pink to green to black. It is non-foliated and is usually found in granite pegmatites. Topaz is primarily bright royal blue in color, although it can also be yellow, pink, or white. It is non-foliated and is commonly found in granite and rhyolite. Spodumene, on the other hand, has long red crystals and is typically found in metamorphic rocks such as pegmatites.
When compared to other gems we have studied, tourmaline, topaz, and spodumene have distinct differences. For example, tourmaline has a wider range of colors compared to other gems. Topaz is unique for its bright royal blue color, while spodumene stands out for its long red crystals.