This is whiskey quartz - sometimes called whiskey citrine. It is a naturally occurring quartz similar to smoky citrine or smoky quartz, but it has a deep bourbon color. Metaphysically, it combines the properties of citrine and smoky quartz, so it's a prosperity or merchant's stone that can also transmute negative energy to positive.
This is a great stone to use if you're trying to change negative financial energy in your life, and it is also good for helping you change from lack consciousness to prosperity consciousness. So if you are someone who struggles with lack consciousness; that is, even if you're working on prosperity affirmations, your day to day (or moment to moment) thoughts often reflect lack and cancel or override your prosperity affirmations (thoughts such as I can never afford this, This is too expensive, I'm going to run out of money, or How am I going to pay my bills this week?), then carry whiskey quartz with you to help change those thoughts to positive, abundance-based thoughts. For example, the second you catch yourself thinking, "How am I going to afford to pay this bill?" change the thought to, "I have all the money I need to pay my bills." The whiskey quartz can help you catch yourself in those thoughts and change them from lack-based to abundance-based beliefs, thus changing negative beliefs about abundance to positive energy.