There are many crystals that are believed to help alleviate loneliness and promote a sense of connection with others. Here are a few examples:

1. Rose Quartz: This is known as the "stone of love" and is commonly used to attract love or heal emotional wounds. It is said to promote feelings of self-love and compassion, which in turn can lead to stronger connections with others.

2. Amethyst: This is said to promote inner peace and can help calm anxiety and depression, which can often contribute to feelings of loneliness. It is also believed to enhance intuition and spiritual awareness.

3. Citrine: This is sometimes referred to as the "happy stone" and is said to promote joy, confidence and abundance. These positive qualities can help you feel more content and fulfilled in your own company, which can make it easier to form connections with others.

4. Moonstone: This is said to promote emotional balance and can help ease feelings of isolation and loneliness. This stone is also associated with feminine energy, which can help you tap into your inner strength and creativity.