That looks like one of the 9 forms of iron oxide that can be found here on earth ... hematite! Hematite screams metal to anyone that finds it and then throws the non-magnetic curve . You can prove it's hematite with the characteristics you've given and one more test. The streak test. Find a dinner plate that has a rough surface where it contacts the table. Rub your sample on the rough surface. Whatever color is left behind is the mineral's streak. If nothing is left behind it's got no streak or clear. Hematite will leave a distinct red streak behind. Magnetite (that pesky black sand) a black one.